基本解释[动力与电气工程]继电器衔铁触点英汉例句双语例句Relay which uses the electromagnetic field of a coil to attract an armature and close the contact points.利用吸引线圈产生磁场，吸引衔铁并闭合触点。relay armature contact更多例句专业释义动力与电气工程继电器衔铁触点