一般生产车间配电线路的巡视周期为()，易燃、易爆和多尘、潮湿、高温、有腐蚀性等特殊场所的车间，配电线路的巡视周期为()。
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The upper class is also called the out-of-sight class because______.
A. they don" t communicate with any people
B. they spend most of their time abroad
C. they move frequently from the general public
D. they keep away from the general public
巡视检查车间配电线路时，应重点检查()、()、()和()等情况。
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