甲、乙两容器内都在进行A→B的反应，甲中每分钟减少4 mol，乙中_爱下问搜题

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问题选择题

甲、乙两容器内都在进行A→B的反应，甲中每分钟减少4 mol，乙中每分钟减少2 mol，则两容器中的反应速率

A．甲快

B．乙快

C．相等

D．无法判断[

答案

答案：D

选择题

Not until he received the invitation ________to attend the summit held in New York.

A．did he decide

B．he had decided

C．had he decided

D．he decided

判断题

光电跟踪气割机的优点之一是对仿形图绘制精度要求不高。