单项选择题
A.30ms B.40ms C.50ms D.60ms
A.49Hz~50.5Hz B.49.5Hz~50.5Hz C.49Hz~50.2Hz D.49.5Hz~50.2Hz
A.2s,0.9倍 B.2s,1.0倍 C.3s,0.9倍 D.3s,1.0倍
A.0.8~1.0 B.0.9~1.1 C.1.0~1.2 D.0.8~1.2
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