【单选题】【消耗次数：1】
符合线槽敷线一般规定的是（ ）。 ①电线在线槽内应有一定余量，不得有接头；②电线按回路编号分段绑扎，绑扎点间距不应大于4m；③同一回路的相线和零线，敷设于同一金属线槽内；④同一路径无电磁兼容要求的配电线路，可敷设于同一金属线槽内。
①
①②③
②
②③④
③
①②③④
④
②③④
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