A.625mm B.650mm C.675mm D.680mm
A.2.8 B.3.5 C.4.5 D.5.5
A.降低 B.升高 C.不变 D.变稠
A.0.45 B.0.55 C.0.65 D.0.75
A.温度高，重负荷 B.温度高，易受潮湿 C.转速较高 D.转速较低
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