单项选择题
Hydrocarbon vapors are usually detected by the use of the （）.
A.flame safety lamp B.combustible gas indicator C.gasometer D.oxygen indicator
单项选择题 A fire involving trash and paper waste would be classified as a （）.
单项选择题 A fire in a pile of dunnage would be classified as a （）.
单项选择题 In cleaning up an oil spill, the use of straw or reclaimed paper fibers would be an example of which type of oil removal?（）
