“两端凿进法”><“竖井开凿法”>!<“人字形线路”人“!”没有点,"<",">"为箭头大致为这样
两端凿进法:→←竖井开凿法:→↓←人字形线路:人
两端凿进法”><“竖井开凿法”>!<“人字形线路”人“!”没有点,"<",">"为箭头大致为这样
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