Amy and Sarah ______________ chess. [ ]
A. is playing
B. is play
C. are playing
答案:C
眼球外旋时,主动肌为()。
A、上直肌
B、下直肌
C、上斜肌
D、下斜肌
需要指定行标题和列标题的查询是______。
A.交叉表查询 B.参数查询C.操作查询 D.标题查询