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SKI£400型异构化催化剂是以氧化铝、沸石为担体的载铂双功能催化剂，沸石为异构化催化剂提供的功能是（)。

A.金属

B.酸性

C.裂解

D.加氢

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更多“ SKI£400型异构化催化剂是以氧化铝、沸石为担体的载铂…”相关的问题

第1题

只要异构化催化剂表面上有积碳，乙苯转化率就会大幅下降。（)

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第2题

异构化反应初期催比剂活性高，随着催化剂活性的变化，反应温度需（)。

A.提高

B.不变

C.降低

D.不一定

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第3题

异构化反应中，在氢分压不变的情况下，提高氢纯度有利于降低催化剂的积炭速度。（)

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第4题

异构化反应物产物中只有EB含量升高的可能原因是（)。

A.催化剂的金属功能下降

B.催化剂的酸性功能下降

C.催化剂的活性下降

D.反应的氢分压低

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第5题

二甲苯异构化反应中，降低空速时应（)，以延缓催化剂活性的下降速度。

A.降低反应温度

B.降低氢油比

C.降低反应的氢分压

D.提高氢油比

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第6题

异构化催化剂气提时，应每隔2小时对系统低点进行排液，其结束的条件是（)。

A.至少进行连续12小时气提

B.至少进行24小时气提

C.进行48小时气提

D.至少进行72小时气提

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第7题

挤塑板是以聚苯乙烯树脂辅以聚合物在加热混合的同时，注入()，而后挤塑押出连续性闭孔发泡的硬质泡沫塑料板，其内部为独立的密闭式气泡结构。

A.憎水剂

B.催化剂

C.透水剂

D.防水剂

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第8题

在清理完主催化剂贮罐底部Y型过滤器时，无须保证滤芯必须是干燥的。（)

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第9题

清理主催化剂贮罐底部Y型过滤器应佩带（)。

A.防护镜

B.防护镜、乳胶手套和防尘口罩

C.防护镜、乳胶手套

D.防护镜、防尘口罩

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第10题

The first snowboards were made in the 1960s. However, it was in the late 1970s that they b

ecame more【C1】______Throughout the 1980s, more and more people began taking up the sport, even though snowboards were not allowed on most ski hills.【C2】______its earlier problems, snowboarding is now the world's 【C3】______ growing winter sports and most resorts (度假地) welcome snowboards.

In 1963, a Grade 8 student named Tom Sims【C4】______ a ski-board for a school project in New Jersey. Then in 1966, a man named Sherman Poppen【C5】______ two skis together for his kids on Christmas day. He called his invention "the Snurfer," which 【C6】______ the words "snow" and "surf". In 1969, Jack Burton Carpenter received a【C7】______for Christmas. He soon began designing boards, and today "Burton" is a popular【C8】______of snowboard.

By the 1980s, snowboarding had become very popular.【C9】______, most ski resorts did not allow snowboarding because they thought it was too【C10】______. Since many snowboarders were young, many older skiers did not want them on the ski hills. The snowboarders had to go to the backcountry, 【C11】______ patrolled (有巡逻的) resorts.

Rejection at the resorts did not【C12】______snowboarding from growing in popularity. Eventually, the owners of ski resorts changed their views. They 【C13】______that they could make more money by allowing snowboarding. One by one, the resorts【C14】______ to welcome snowboards. Today, many resorts even set【C15】______special areas where snowboarders can practice their creative tricks.

【C1】

A．spreading

B．popular

C．ordinary

D．interesting

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第11题

XFG－7型高频信号发生器输出400KHZ的正弦波，“调幅选择”钮应放到“400”档位。（)

XFG-7型高频信号发生器输出400KHZ的正弦波，“调幅选择”钮应放到“400”档位。()

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