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问题 单项选择题

某真空精馏塔的塔顶直空表读数为400mmHg，当地大气压为100kPa，精馏塔内的绝对压力为( )。

A．(46.68kPa

B．(0.533bar

C．(4.74mH2O

D．(0.544kgf/cm2

答案

参考答案：A

改错题

Mr Wang is my physics teacher. He has 1.75 meters in the height. He was born on November 4, 1952. So he is a middle-aged man. He graduated Qinghua University in 1983. After graduation, he becomes a middle school teacher. He has been taught physics for more than 20 years. He is very succeed as a teacher. He has been given a lot of honor. He not only is a good teacher in physics but also speak English and Russian very well. In his spare time, he likes reading books, collect stamps and listening music. Also, Mr Smith is kind-hearted.
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问答题 简答题

试述旅游路线设计的理论原则。
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