单项选择题
The signal given to commence lowering the lifeboats is（）.
A.3 short blasts of the ship's whistle B.1 short blast of the ship's whistle C.3 long blasts of the ship's whistle D.1 long blast of the ship's whistle
单项选择题 The order to enter the lifeboats will be given from the（）.
单项选择题 The operating cord on an inflatable liferaft should be renewed by（）.
单项选择题 The number of flashlights required as lifeboat equipment on a seagoing barge is（）.
