BTS3812机柜从上至下由开关盒、风扇框、（）、（）、电源框和NLPA框等机框构成。
查看答案
As to the piston cooling, of the following, which statement is not true?（）
A. Because the piston is exposed to very high temperature, it must be cooled
B. The lower the piston cooling temperature is, the better it is
C. Both water and lube oil can be used as coolant
D. One of the piston cooling methods is vibration cooling, with better effect
国家税务局、地方税务局同一纳税人的税务登记应当采用同一代码，信息共享。
A. 正确
B. 错误
论述20世纪以来，用现代学术研究的理论与方法研究中国政治制度史的四个阶段。
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