单项选择题
Which of the following conditions is true concerning a flammable liquid with a concentration above the upper explosive limit?（）
A.The mixture is too lean to burn B.The mixture is too rich to burn C.The vapor is about to explode D.Conditions are perfect for combustion
单项选择题 The volatility of a liquid is the tendency of a liquid to （）.
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（）.
