[单选] Water is a very effective fire extinguishing agent because it（）
A . will remove all the toxic fumes from the air B . has the greatest cooling ability C . will leave no harmful residue D . completely removes combustible vapors from the air
As it approaches，a typical warm front will bring（）. rising temperatures and falling barometric pressure。 falling temperature and pressure。 falling temperatures and rising pressure。 rising barometric pressure and temperature。
液化石油气发生泄漏后，必须坚决消除危险区域内的一切火种，积极组织群众疏散到安全地带。
液化石油气在液相燃烧时，呈鲜艳的橙黄色火焰。
简述如何理解“质量大堤”？
构架横梁的内腔与空气弹簧支撑梁的内腔共同组成空气弹簧的附加空气室。
Water is a very effective fire extinguishing agent because it（）
