单项选择题
Handholds or straps on the underside of an inflatable liferaft are provided（）.
A.to right the raft if it capsizes B.to carry the raft around on deck C.for crewmen to hang on to D.to hang the raft for drying
单项选择题 Halon fire extinguishers are NOT effective when used on which types of fires?（）
单项选择题 Guide tolerances during elevation of the jack-up rig will（）.
单项选择题 Great Salt Pond on Block Island is（）.
