單項選擇題It is the only entrance()the harbor for vessels of moderate draught.

A.to
B.for
C.on
D.over


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1.單項選擇題Loading cargo operation in hold No.3 stopped owing to().

A.gangs employed
B.windlass trouble
C.gangs unavailable
D.shortage of navigational charts

2.單項選擇題Mariners must ascertain that deck loads are stowed in such a manner as().

A.to affect the vessel's stability
B.not to affect the vessel's stability
C.to keep the vessel on even keel
D.not to keep the vessel on even keel