These fans have a thermostatically controlled viscous clutch. 這類風扇由粘性離合器控制。
The start and stop of the machine are carried out by a multiple-disk clutch and the reciprocation of the ram is achieved by a crank connecting link. 本機床的啟動與停止用一多片式離合器控制，滑枕的往複運動通過曲柄連桿機構實現。
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