隔离衣一般情况下更换时间是()
A.6h
B.12h
C.24h
D.48h
E.72h
参考答案:C
Your mother _______, however, say that to us that day.
A.does
B.did
C.is doing
D.was doing
禁止出卖属于()所有的档案。
A、公民
B、法人
C、国家