在O/N分析中,排气功率要比分析功率要()
A、高
B、低
C、一样
参考答案:A
____ Lily ______ Lucy may go with you because one of them must stay at home.
A.Not only ... but also
B.Both ... or
C.Both ... and
D.Either ... or
6~12岁的儿童检查可用()。
A.内径3.5~4.0mm的支气管镜
B.内径4.0~4.5mm的支气管镜
C.内径5.0mm的支气管镜
D.内径5.0~7.0mm的支气管镜
E.内径7.0~9.0mm的支气管镜