The signal given to commence lowering the lifeboats is（）.<br>A:3 short blasts of the ship's whistle<br>B:1 short blast of the ship's whistle<br>C:3 long blasts of the ship's whistle<br>D:1 long blast of the ship's whistle

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

出自：海船船员证

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