单项选择题
A.高速顺时针 B.高速逆时针 C.低速顺时针 D.低速逆时针
A.3% B.5% C.1% D.8%
A.10%-20% B.30%-50% C.8%-14% D.2%-8%
A.3%-8% B.1%-3% C.5%-10% D.10%-20%
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