安全库存
何种原因使工作母线失去电压时，BZT（RAC）装置应该启动，投入备用电源？
预制渡槽槽身的特点有（）。 ["轻，巧，强，薄","工艺简单","成本低","省时省工"]
You are trying to change the polling parameters used by the location manager via the Cisco WCS， and yourrequest is being denied. What is wrong？（） ["Your login does not have the correct permissions.","You must wait for the location server to become available.","Polling values can be changed only on the location server.","Polling values can be changed only in the maintenance window."]
衡量矿山压力显现程度的指标（）。 ["顶板下沉量及速度","顶板破碎情况","支柱变形与折损","局部、大面积冒顶"]
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