采掘工作面瓦斯和二氧化碳浓度,低瓦斯矿井中每班至少2次;高瓦斯矿井中每班至少3次。
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对加压侧绕组为D接线的三相变压器测量短路阻抗,用单相法测试时,应做好相应的()。
A. 短接
B. 开路
C. 接地
D. 短路并接地
从Visual FoxPro6.0发布后,Microsoft公司就把它同()、()和()等软件产品一起捆绑销售。
HXD2型电力机车压缩机运行扳键信号在微机显示屏内显示是()。
A. 1970A
B. 1970B
C. 1970C
You are planning to deploy Windows 7 to all client computers in your network. You need to ensure that domain administrators can manage domain Group Policy objects (GPOs) from their Windows 7 computers. What should you provide to the domain administrators?()
Administration Tools Pack
B. GPOAccelerator Tool
C. Local Group Policy Editor
D. Remote Server Administration Tool