( )属于企业人力资源规划的外部环境。
A.经济环境
B.人口环境
C.科技环境
D.文化法律等社会因素
E.企业文化
参考答案:A,B,C,E
阵发性室上性心动过速的发生机制主要是 ()
A.心肌缺血
B.折返机制
C.高血压病
D.感染性心内膜炎
E.洋地黄中毒
Portable CO2 fire extinguishers should NOT be used to inert a space containing flammable liquids due to the danger of().
A.the CO2 being inhaled by personnel
B.reflash of burning liquids
C.vapor condensation on the extinguisher
D.the discharge causing a static spark