380／220V中性点接地系统中，电气设备均采用接零保护。
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A celestial body will cross the prime vertical circle when the latitude is numerically（）.
A. greater than the declination and both are of the same name
B. less than the declination and both are of the same name
C. greater than the declination and both are of contrary name
D. less than the declination and both are of contrary name
查看门户系统中的Dailring分析图表时需要安装什么插件（）。
A. OIC插件
B. Flash插件
C. Office插件
D. PDF插件
导线在切割前，要先用细铁丝在切口两边绑扎牢，以防切割后散股。
A. 正确
B. 错误
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