【单选题】
当船舶停靠码头时,为了保证船货安全,有必要24小时值班。（）
A、When a vessel is alongside the wharf, it’s necessary for the ship to keep a 24-hour deck watch to guarantee the safety of the ship and the cargo.
B、When a vessel is alongside the wharf, t’s necessary for the ship to keep a 24-hour gangway watch to guarantee the safety of the ship and the cargo.
C、When a vessel is alongside the port, it’s necessary for the ship to keep a 24-hour deck watch to guarantee the safety of the ship and the cargo.
D、When a vessel is alongside the port, it’s necessary for the ship to keep a 24-hour gangway watch to guarantee the safety of the ship and the cargo.
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