题目内容

在架空线路的巡视中，发现导线断落在地面或悬挂在空中，应在()范围内设法防止他人靠近。

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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

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在架空线路的巡视中，发现导线断落在地面或悬挂在空中，应在()范围内设法防止他人靠近。

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()。

单相触电作用于人体的电压是380V。()

北参考答案：正确海白塔塔身有400个通风口。()

The upper class is also called the out-of-sight class because______.