By measuring the opening coil exciting time of Permanent Magnetic Actuator (PMA), a requirement of shortening the exciting time further is proposed.
通过测试永磁机构分闸线圈激磁时间，提出进一步缩短激磁时间的要求。
The right use method of wire rope is expounded from such aspect as opening coil mode, penetrating and winding mode, cut off and lashing mode of wire rope.
从钢丝绳的开卷方式、穿绕方式、切断扎结方式等方面论述钢丝绳的正确使用方法。详细介绍塔式起重机用钢丝绳的日常检查和维护的方法，给出报废原则。
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