【单选题】I was on the highway _______ this car went past followed by a police car. They ______ at least 150 kilometers an hour.
A.
when; should have been driving
B.
while; would have driven
D.
when; must have been driving
【简答题】Listen to the passage and supply the missing words or phrases. Answer the following two quetions based on what you have heard. As the car industry develops, traffic accidents have become as...
【简答题】决策的过程包括哪些步骤?每一步骤需要注意哪些问题?
【多选题】工程上,把长度远大于横截面积的构件叫杆件,在外载荷作用上,杆件可能会发生尺寸和形状的变化,通常把杆件变形简化为下列( )几种。
【简答题】乙苯脱氢反应是体积增大的反应,( )压力对反应有利。