单项选择题
A.acrylic acid
B.benzene
C.oleum
D.vinyl toluene
单项选择题 Oceangoing dry bulk cargo vessels over 1000 GT must have approved combination-type fire nozzles at all（）.
单项选择题 Most very large ocean going vessels，such as bulk carriers and large tankers，tend to squat（）.
单项选择题 Lighter longitudinal stiffening frames on the vessel side plating are called（）.