单项选择题
The litter on a ship must be able to（）.
A.carry at least two injured persons B.float for at least two hours C.be used on the types of helicopters serving the unit D.All of the above
单项选择题 The lifesaving signal indicating You are seen - assistance will be given as soon as possible is the（）.
单项选择题 The holding power of an anchor is the（）.
单项选择题 The hoist line primarily used for lifting personnel on ship cranes is called the（）.
