单项选择题
Hanging a barge off means to（）.
A.moor a damaged barge to the bank and leave B.remove and deliver a loaded barge from a multiple tow C.remove a barge while locking through D.tow an empty barge astern
单项选择题 Handholds or straps on the underside of an inflatable liferaft are provided（）.
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（）.
