The full utilization of berths can be achieved if（）.<br>A:ships arrive at random<br>B:cargo-handing time varies greatly<br>C:ships have to queue to get onto berths<br>D:ships do not have to wait to get onto berths

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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