单项选择题
The volatility of a liquid is the tendency of a liquid to （）.
A.ignite B.explode C.asphyxiate D.vaporize
单项选择题 An oxygen indicator will detect （）.
单项选择题 When making entries in the Oil Record Book, all quantifies should be（）.
单项选择题 When fighting a spreading fire resulting from a broken fuel line, you should FIRST （）.
