“风湿”是指（）

A.风湿性疾病

B.累及骨骼、肌肉组织的疾病

C.关节、关节周围软组织、肌肉骨骼的慢性疼痛

D.弥漫性结缔组织病

E.胶原病

A definite advantage of using water as a fire extinguishing agent is its characteristic of（）.

A.alternate expansion and contraction as water in a liquid state becomes a vapor

B.absorption of smoke and gases as water is converted from a liquid to a vapor

C.rapid contraction as water is converted from a liquid to a vapor

D.rapid expansion as water absorbs heat and changes to steam