单项选择题
The hydrostatic release on the inflatable liferafts on a fishing vessel must be（）.
A.replaced annually B.tested monthly C.serviced annually D.overhauled quarterly
单项选择题 The capacity of any liferaft on board a vessel can be determined by（）.
单项选择题 The bosun has thrown the liferaft into the water before abandoning the vessel. The operating cord（）.
单项选择题 The air spaces in the floor of an inflatable liferaft will provide protection against（）.
