【判断题】
一切电气设备的金属外壳接地是避免人身触电的保护接地。正确答案、
A. 对
B. 错
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答案
A
解析
暂无解析
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安全阀是一种由进口静压开启的自动泄压装置，防止容器超压。当容器内压力超过某一值时，阀门依靠介质自身压力自动幵启，迅速排除一定数量的介质。但是当容器内压力降低到允许值时，阀门不会自动关闭
A. 对
B. 错
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