单项选择题
Spreading oil on the open sea has the effect of（）.
A.diminishing the height of the seas B.lengthening the distance between successive crests C.increasing the height of the seas D.preventing the wave crests from breaking
单项选择题 Sour crude oil（）.
单项选择题 Releasing oil from the sea anchor of a survival craft may（）.
单项选择题 Reid vapor pressure is（）.
