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【单选题】
电动机轴承要运行平稳、低噪音、经济和支撑结构简单等,因此()类型是电动轴承的最佳选择A.
圆柱滚子轴承
B.
推力球轴承
C.
调整球轴承
D.
深沟球轴承
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【简答题】The government has paid a lot of _________ to the over _________ of this kind of Hutong. Now, more old Hutongs are being __________ and supported by the government to __________ the increasing number...
【简答题】电磁波在自由空间传播时 , 距离每增加一倍 , 损耗增加 ( )dB。
【单选题】Which of the following statements is NOT true according to the passage? ______
A.
Hutongs and Siheyuans have been regarded to be a cultural asset.
B.
The covering area of Shichahai is overl46 hectares.
C.
Foreigners like going to bars located in Hutongs.
D.
There are 30 historical and cultural protected areas in Beijing.
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