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.
A.in spite of B.irrespective C.in respect D.in matter of
单项选择题 An ABC dry chemical fire extinguisher would be least effective against a fire in（）.
单项选择题 An advantage of a dry chemical over a carbon dioxide fire extinguish is its（）.
单项选择题 An advantage of an ABC dry chemical over a carbon dioxide extinguisher is（）.
