高血压合并支气管哮喘者不宜选用的药物是

A．普萘洛尔
B．可乐定
C．卡托普利
D．肼屈嗪
E．氢氯噻嗪

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