单选题The full utilization of berths can be achieved if（）.Aships arrive at randomBcargo-handling time varies greatlyCships have to queue to get onto berthsDships do not have to wait to get onto berths
单选题
The full utilization of berths can be achieved if（）.
A
ships arrive at random
B
cargo-handling 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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