第五课 合法下载网络中的文件

手掘式顶管机即对错机械的开放式(或敞口式)顶管机，在施工时，选用手工的方法来破碎办公面的土层，破碎辅助工具主要有镐、锹以及冲击锤等。破碎下来的泥土或岩石能够通过传送带、手推车或轨道式的运输矿车来运输

(The hand-dug pipe jacking machine is an open (or open) pipe jacking machine of the right and wrong machine. During construction, manual methods are used to crush the soil layer of the office surface. The auxiliary tools for crushing are mainly picks, shovels and impact hammers. Wait. Broken dirt or rock can be transported by conveyor belts, trolleys or rail-mounted minecarts)

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