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? （）
A.Cirrus B.Cumulus C.Stratus D.Nimbus
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（）.
单项选择题 All towing vessels of 26 feet or longer while navigating are required to carry which item? （）
