盛装惰性气体液氩的低温绝热气瓶检测周期为（）。
A、2年
B、3年
C、5年
参考答案：B
_______________, we don’t have much spare time at the moment．
A．relaxing as doing sport is
B．As doing sport is relaxing
C．relaxed as doing sport is
D．As doing sport is relaxed
（）is the maximum speed of your ship?
A.How
B.Which
C.How about
D.What
