单选题A life buoy should be located at the gangway door.（）A舷梯口应放置一个救生衣。B舷梯口应放置一个救生服。C舷梯口应放置一个救生圈。D救生圈应放在船上。
单选题
A life buoy should be located at the gangway door.（）
A
舷梯口应放置一个救生衣。
B
舷梯口应放置一个救生服。
C
舷梯口应放置一个救生圈。
D
救生圈应放在船上。
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