单项选择题
An “on-load” release system on a survival craft means the cable can be released（）.
A.only when the load is taken off the cable B.only when there is a load on the cable C.only when activated by the controls at the lowering station D.at any time
单项选择题 An “atoll cloud” forming over an island due to heating of the land during the daytime would be which type? （）
单项选择题 An “ABC” dry chemical fire extinguisher would be LEAST effective against a fire in（）.
单项选择题 AMVER is a system which provides（）.
