GPS基准授时子系统能够接收高精度的()作为整个系统的基准时间。
A.卫星时间
B.电脑时间
C.定位时间
D.授时时间
参考答案:A
I was told that there were about 50 foreign students __________Chinese in the school, most __________were from America.
A.study;of whom
B.study;of them
C.studying;of them
D.studying;of whom
运用成本法评估计算机软件的特点是什么