单项选择题
（）does it take to change the main engine from ahead to astern?
A.How many times
B.How much water
C.How long
D.How length
点击查看答案&解析
相关考题
-
单项选择题
（）, we continued lifting out the pistons.
A.Late as it was
B.As it was late
C.Since it was late
D.Because of its late -
单项选择题
The exhaust valve is opened at about the same time （） the air inlet ports are opened.
A.before
B.after
C.when
D.until -
单项选择题
When entering a foam injected space （） breathing apparatus.
A.put out
B.put on
C.take off
D.take in
