單項(xiàng)選擇題As these features are not all charted, special caution should be exercised（）vessels navigating in the vicinity.

A.by
B.with
C.on
D.in


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1.單項(xiàng)選擇題Attention is called to the fact that in many cases charted depths may be decreased by up to（）.

A.one natutical mile
B.2 kilometers
C.5 cables only
D.one fathom

2.單項(xiàng)選擇題Be careful（）to mix them up.

A.don't
B.won't
C.not
D.must not

3.單項(xiàng)選擇題Can you cut down the shortlanded cargo（）half?

A.at
B.in
C.by
D.with

4.單項(xiàng)選擇題Charted depths are decreased（）2 meters.

A.in
B.on
C.with
D.by

5.單項(xiàng)選擇題Chief, I see that ship（）to her port.

A.turns
B.turning
C.to turn
D.be turning