A possible cause for an individual piston to knock when at TDC on a slow-speed, two-stroke/cycle main propulsion diesel engine could be due to ()
A. early fuel injection
B. excessive bearing play within the running gear
C. overloading of the cylinder
D. all of the above
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布迪厄如何论述场域的特点?怎样借鉴布迪厄的场域观点开展社会学研究?
在无线电技术中,常把U/Um从1/√2下降到对应的两个频率的范围称为通频带,对应于-3dB。
A. 正确
B. 错误