题目内容

在铺设钢轨时,左右钢轨对接与左右钢轨错接,分别会引起电力机车的哪些不良振动?

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When an oil fire has been extinguished, the surface of the oil should be kept covered with foam to prevent ().

A. air from contacting the oil vapors
B. permitting re-ignition boiling of the heated oil
C. spontaneous combustion below the oil surface
D. toxic fumes from escaping to the surface

增温增湿滚筒不运动的原因之一是:筒体传动装置的链条松,无法带动筒体正常运转。

A. 正确
B. 错误

WWW最初是由()实验室研制的。

A. CERN
B. AT&T
C. MicrosoftInternetLab
D. ARPA

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