key on
... key chain 钥匙扣；钥匙链 key on 接通；楔入；用键固定 private key 私人密钥，个人密钥（用于把即将发送的消息进行加密的密钥） ...
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接通用键固定 key on
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内环与轴用键联接，外环尺寸公差为h 7与公差为h7的机壁配合，外环两侧端面键用于固定外环与机壁以传递扭矩。
The inner race is keyed to the shaft. The outer race has h7 tolerance and should be fitted in housing with a k7 tolerance. Additional side notches provide for positive torque transmission.
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