單項(xiàng)選擇題

Routine radio communications should be no more than（）.

A.one minute
B.three minutes
C.five minutes
D.eight minutes

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單項(xiàng)選擇題

PORT A BIT SLUGGISH means that port rudder（）.

A.answers very well
B.rudder answers all right
C.answers slow
D.answers fast

單項(xiàng)選擇題

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

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