The advantage of USB is joining convenient and high transfer data rate.
USB的优点是连接方便和数据传输速率高。
It has the features of long torque, small current, high rate transfer and mechanical soften.
具有起动转矩大，起动电流小，转差率高和机械特性软等特点。
It has the features of long torque, small current, high rate transfer and mechanical soften.
具有起动转矩大，起动电流小，转差率高和机械特性软等特点。
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