用短钢钎和四磅锤在大石上凿楔型眼,置入钢楔子,两边各加一片树叶润滑。再以十八磅以上的大锤猛击楔子,大石就裂开了。用成列的楔子能打出柱子,电线杆呢。
古时那来的机器?
用短钢钎和四磅锤在大石上凿楔型眼,置入钢楔子,两边各加一片树叶润滑。再以十八磅以上的大锤猛击楔子,大石就裂开了。用成列的楔子能打出柱子,电线杆呢。
古时那来的机器?
•
我知道那个,我说了除非全部用人工嘛 :)
--康七郎-
♂
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09/15/2011 postreply
12:17:24
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