The lockmaster has given you permission to tie off on the lower guide wall to wait your turn to lock through. What should you be most concerned with? （）<br>A:A downbound vessel<br>B:An upbound vessel<br>C:Current reaction when the lock chamber is being emptied<br>D:Current reaction when the lock chamber is being filled

The lockmaster has given you permission to tie off on the lower guide wall to wait your turn to lock through. What should you be most concerned with? （）
A:A downbound vessel
B:An upbound vessel
C:Current reaction when the lock chamber is being emptied
D:Current reaction when the lock chamber is being filled

出自：海船船员证

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