题干
第四部分：单项选择（共10小题，每题1分，共10分）
______ for our teachers, we’d never have been able to enter this university.
A：Had it not bee
B：Had it not
C：If it was not
D：If he had not bee
答案(点此获取答案解析）
A
同压下测定，且b>a,则充分反应后，试管中气体在同温同压下的体积为（ ）
