单项选择题
Shall we（）wait at the roadstead till there is a free berth for us?
A.must
B.ought to
C.have to
D.never
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Routine radio communications should be no more than（）.
A.one minute
B.three minutes
C.five minutes
D.eight minutes -
单项选择题
PORT A BIT SLUGGISH means that port rudder（）.
A.answers very well
B.rudder answers all right
C.answers slow
D.answers fast -
单项选择题
Free communication effect is in direct proportion to（）.
A.length and width of space
B.length of space only
C.width of space only
D.neither length nor width
