单项选择题
A.cleanly/during
B.clear/meawhile
C.clean/between
D.clean/prior to
单项选择题 All vessel personnel should be familiar with the survival crafe’s（）.
单项选择题 All vessels（）size shall, whether in a fairway or not,observe the International Regulation for Preventing Collisions at Sea 1972.
单项选择题 An ABC dry chemical fire extinguisher would be least effective against a fire in（）.