Switch to the Search TAB (reference Figure 9), click on the query statistic icon, and you can enter the window of the query statistic (illustrated in Figure 2).

转换到Search选项卡(参考图9)，单击Query statistic图表，然后输入查询数据的窗口(如图2所示)。

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This article has made statistic and analyses on many types of flameproof button and switches used in coalmine, such as travel switch, limit switch, pull switch, and so on.

就煤矿井下现用的隔爆按钮以及行程开关、限位开关、打点器、拉线开关、井口开关等进行了统计、分析，针对使用中出现的问题提出了改进措施。

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