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有关SOMATOM go. Fit的球管 ,下面哪些说法是正确的()
A.采用了西门子原厂的零兆球管
B.IGBT球管
C.能实现13档kV定制化扫描
D.超长300秒曝光
![](https://static.youtibao.com/asksite/comm/h5/images/m_q_a.png)
BCD
![](https://static.youtibao.com/asksite/comm/h5/images/solist_ts.png)
A.采用了西门子原厂的零兆球管
B.IGBT球管
C.能实现13档kV定制化扫描
D.超长300秒曝光
BCD
A.在馏程实验中,温度计与烧瓶轴心线相切。
B.在馏程实验中,温度计水银球上边缘与支管焊接处的下边缘在同一水平面。
C.蒸馏烧瓶安装时不得歪斜且各连接处必须密封。
D.干点与终馏点是同一个含义。
E.在馏程实验中,10%馏出温度与起动性能有关,50%馏出温度与加热性能有关,90%馏出温度与燃烧安全性有关。
A.准直宽度是指在多层螺旋扫描方式时,决定层厚的是所采用探测器排的宽度
B.T机球管侧和受检者侧所采用准直器的宽度
C.有效层厚指扫描时实际所得的层厚
D.层厚越小,误差越大
E.层厚的误差与扫描所采用的方式和设备的类型有关
F.
But college has never been able to work its magic for everyone. And now that close to half our high school graduates are attending, those who don't fit the pattern are becoming more numerous, and more obvious. College graduates are selling shoes and driving taxis; college students interfere with each other's experiments and write false letters of recommendation in the intense competition for admission to graduate school. Others find no stimulation in their studies, and drop out—often encouraged by college administrators.
Some observers say the fault is with the young people themselves—they are spoiled and they are expecting too much. But that's a c6ndemnation of the students as a whole, and doesn't explain all campus unhappiness. Others blame the state of the world, and they are partly right. We've been, told that young people have to go to college because our economy can't absorb an army of untrained eighteen-year-olds either.
Some adventuresome educators and campus watchers have openly begun to suggest that college may not be the best, the proper, the only place for every young person after the completion of high school. We may have been looking at all those surveys and statistics upside down, it seems, and through the rosy glow of our own remembered college experiences. Perhaps college doesn't make people intelligent, ambitious, happy, liberal, or quick to learn things—maybe it's just the other way around', and intelligent, ambitious, happy, liberal, quick-learning people are merely the ones who have been attracted to college in the first place. And perhaps all those successful college graduates would have been successful whether they had gone to college or not. This is heresy to those of us who have been brought up to believe that if a little schooling is good, more has to be much better. But contrary evidence is beginning to mount up.
What does the author believe according to the passage?______
A.People used to question the value of college education
B.People used to have full confidence in higher education
C.All high school graduates went to college
D.Very few high school graduates chose to go to college