消防站内供迅速出动用的通道净宽,单面布房时不应小于1.4m,双面布房时不应小于2.0m,楼梯不应小于()m。
A.1.4
B.1.6
C.1.8
D.2.0
参考答案:A
串行通信的波特率越高,则串行传送数据的速度______。
A.越慢
B.越快
C.与波特率无关
D.由CPU速度决定
_________ for the free tickets, I would not have gone to the films so often.
A.If it is not
B.Were it not
C.Had it not been
D.If they were not