对客观事物的条件假设中，环境假设方面包括（）。 A.经济 B.技术 C.政治 D.时

电梯门的安全触板的撞击力，一般应控制在（）.

A．10kg以内

B．2kg以内

C．1kg以内

D．0.5kg以内

（）是通过支持别人取得自我心理安宁的一项活动。

A.家庭

B.工作

C.爱好

D.社区参与

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虽然有些寄生虫寄生在人体血管内或血液中，但一般不取外周血作病原学诊断的有哪些？为什么？ 

采掘工作面及其他地点，体积大于（）立方米空间内积聚的瓦斯浓度达到2%时，附近20米内必须停止工作，撤出人员，切断电源，进行处理。

A、0.1

B、0.3

C、0.5

D、1.0