题目内容
（请给出正确答案）
The monitors at the gates of the plant building gave alarms________．
A.only whell Watras was leaving the building
B.whenever Watras's co-workers were leaving the building
C.only when Watras was passing through one day
D.whenever Watras was passing through．them
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更多“The monitors at the gates of t…”相关的问题
Watras understood he was picking up radiation at．home as_________．
A.he always set off alarms when passing through the monitors
B.most of his co-workers passed through the monitors without problem
C.he proved one day he wasn’t picking up．radiation at work
D.scientists found out his house contained radiation
完成下列各题 A
Like everyone else working at the Limerick nuclear-power(核能)plant，Stanley Watras had to pass through the monitors(监测器)before leaving the buildin9．Most of his co-workers．passed through without a problem，but Watras，an engineer，continually set off alarms(警报)．Some days he was found to be carrying six times more radiation(辐射物)than normal． Neither Watras nor his co-workers could understand where he was picking it up． Then one day Watras went through the door at Limerick and turned and walked back through the monitors without ever entering the power block．Yet the machines still said he was carrying radiation．“If I wasn’t picking up radiation at work,there was only one place it could be coming from：my house．” When scientists came to test the Watrases’home in the countryside，they found out what was the matter．The house contained so much radon(氡)that living in it for a year was like being exposed(暴露)to 260，000 chest X-rays．In the year the Watrases had spent there，they had increased their chances of getting lung cancer(癌症)by 13 or 14 percent． The next day the Watrases took down their Christmas tree，put their clothes in some bags and moved into a nearby hotel．“It was terrible，”says Watras． The owner of the Limerick plant took charge of dealing with the Watrases’radon problem as an experiment．Scientists studied every comer of the house．When the ground was dug up，they found that under the house there was a uranium(铀)-beating rock． It was because________ that Stanley Watras was carrying six times more radiation than normal．
A.he worked at a nuclear—power plant
B.there was something wrong with the monitors
C.he lived in a house in the countryside
D.his house was built on a uranium-beating rock
ace level (i.e. the complement of a mark) for one element period. This element is called the start bit and has a duration of T seconds. The transmitter then sends the character, l bit at a time, by placing each successive bit on the line for a duration of T seconds, until all bits have been transmitted. Then a single parity bit is calculated by the transmitter and sent after the data bits. Finally, the transmitter sends a stop bit at a mark level (i.e. the same level as the idle state) for one or two bit periods. Now the transmitter may send another character whenever it wishes.
At the receiving end of an asynchronous serial data link, the receiver continually monitors the line looking for a start bit. Once the start bit has been detected, the receiver waits until the end of the start bit and then samples the next N bits at their centers, using a clock generated locally by the receiver. As each incoming bit is sampled, it is used to construct a new character. When the received character has been assembled, its parity is calculated and compared with the received parity bit following the character. If they are not equal, a parity error flag is set to indicate a transmission error.
(1).When the transmitter wishes to send data, it first ().
A.places the line in a space level
B.puts the line in a mark level
C.sends a stop bit
D.places a bit at logical l level
(2).Then a single parity bit is calculated by the transmitter and ().
A.compared with the received parity bit
B.sent with the data bits
C.sent after the data bits
D.sent before the data bits
(3).At the receiving end of an asynchronous serial data link, the receiver continually monitors the line().
A.waiting for the end of the start bit
B.looking for a start bit
C.generating a clock
D.constructing a new character
(4).When the transmitter wishes to send data , it first sends().
A.a character at the same time
B.a character to the line
C.the start bit
D.a mark level to the line
(5).The transmitter then send the character, for a duration of T seconds().
A.each bit
B.all bits
C.successive bits
D.a start bit and a character
阅读理解
阅读下面的文章，根据文章内容判断文章后的句子是正确(T)还是错误(F)。
THE INTERNATIONAL FOOD SAFETY AUTHORITIES NETWORK (INFOSAN)
With the rapid globalization of food production and trade, international issues related to food safety are likely to increase. Food safety authorities all over the world have realized that food safety problems should be carried out at both national and international levels. There is a pressing need for exchanging routine information on food safety issues, and sharing experiences and information quickly when a food safety related event takes place.
INFOSAN is a joint program between the World Health Organization (WHO) and the Food and Agriculture Organization of the United Nations (FAO). This global network includes 181 Member States. Each has a designated INFOSAN Emergency Contact Point which manages communication between national food safety authorities.
The network aims to:
Promote the rapid exchange of information during food safety related events;
Share information on important food safety related issues of global interest;
Promote partnership and cooperation between countries;
Help countries strengthen their capacity to manage food safety risks.
As part of its routine activities, the INFOSAN Secretariat publishes reports in six languages and provides members with summaries and guidance on relevant food safety issues.
INFOSAN helps exchange food safety information and experience among its members. It is also a useful resource for other public health organizations which recognize INFOSAN as an organization through which findings of investigations and strategies for improving food safety may be shared.
INFOSAN monitors possible international food safety related events in close cooperation with the WHO Alert and Response Operations program. INFOSAN can work with other international organizations to provide assistance to the countries or regions with emerging food safety events of possible international concern.
操作提示：句子正确选择下拉选项框为“T”;句子错误选择下拉选项框为“F”。
1. It is probable that there will be more and more safety related issues worldwide. {T; F}
2. Food safety authorities in each country believe that food safety problems should be solved within their country. {T; F}
3. The major duty of the INFOSAN Emergency Contact Point in each FAO member state is to manage communication between national food safety authorities. {T; F}
4. Public health organizations can get findings of investigations and strategies for food safety improvement from INFOSAN. {T; F}
5. INFOSAN monitors possible international events concerning food safety independently. {T; F}
in a space level (i.e. the complement of a mark) for one element period. This element is called the start bit and has a duration of T seconds. The transmitter then sends the character, l bit at a time, by placing each successive bit on the line for a duration of T seconds, until all bits have been transmitted. Then a single parity bit is calculated by the transmitter and sent after the data bits. Finally, the transmitter sends a stop bit at a mark level (i.e. the same level as the idle state) for one or two bit periods. Now the transmitter may send another character whenever it wishes.
At the receiving end of an asynchronous serial data link, the receiver continually monitors the line looking for a start bit. Once the start bit has been detected, the receiver waits until the end of the start bit and then samples the next N bits at their centers, using a clock generated locally by the receiver. As each incoming bit is sampled, it is used to construct a new character. When the received character has been assembled, its parity is calculated and compared with the received parity bit following the character. If they are not equal, a parity error flag is set to indicate a transmission error.
(1).When the transmitter wishes to send data, it first sends().
A.a character at the same time
B.a character to the line
C.the start bit
D.a mark level to the line
(2).The transmitter then send the character, for a duration of T seconds().
A.each bit
B.all bits
C.successive bits
D.a start bit and a character
(3).Finally, the transmitter sends a stop bit at the same level as for one or two bit periods().
A.the space level
B.the mark level
C.the complement of the mark level
D.another character
(4).At the receiving end of an asynchronous serial data link, the receiver().
A.does not monitor the start bit
B.waits until the beginning of the start bit
C.samples the start bit at its center
D.generates a local clock
(5).When the received character has been assembled, its parity().
A.is set to indicate a transmission error
B.is compared with the received character
C.is an error flag
D.may be equal to the received parity
