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北参考答案：正确海白塔塔身有400个通风口。()

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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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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______.

巡视检查车间配电线路时，应重点检查()、()、()和()等情况。

遇有冲刷、起土、上拔或导地线、拉线松动的电杆，应先()，打好()或()后，再行登杆。

三台单相变压器可以用在三相线路上代替三相变压器。()