同温同压下,等体积的两容器内分别充满和气体,下列对两容器中气体判断正确的是 [ ]
A.中子数相同
B.分子数相同
C.质子数相同
D.气体质量相同
答案:B
We haven't heard from Diana for a long time.What do you think ________ her?[ ]
A. has happened to
B. to happen to
C. has happened on
D. was happening to
范围说明是重要的,因为范围说明()
A、为制定未来项目的决策提供依据
B、提供了项目的简洁概要
C、替项目干系人批准项目
D、提供衡量项目成本的标准