单项选择题

The full utilization of berths can be achieved if（）.

A.ships arrive at random
B.cargo-handing time varies greatly
C.ships have to queue to get onto berths
D.ships do not have to wait to get onto berths

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The KM for a vessel may be determined by which of the following?（）.

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B.Subtracting the KB from the BM
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