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①一般焊接用烙铁的头为甚么要用红铜作成?②蒸气机、內燃机上为甚么都装置有飞轮?③用手锤来锤紧鎯头时,为甚么要在木手柄哪一头打?④有1个6齿的小齿轮和一个18齿齿轮相啮合,大齿轮转1转,小齿轮就绕着自己的轴转3转。请想想看:如果大齿轮不动,小齿轮围着它走完一圈,小齿轮本身要转过几转?⑤焊接金属时,往往在焊接的地方涂上氯化锌、松香或氯化铵(磠砂),这是作甚么用的?⑥一船用的铁砧都作的很沉重,为甚么?⑦在车床上切削金属时,切下来的切屑厚度为甚么总是比切削层厚些?
① general welding iron head why use copper made? ② steam engine, the internal combustion engine why are equipped with a flywheel? ③ hand hammer to tighten the head, why in the wood handle where to play? ④ There is a 6-pinion gear meshing with an 18-pinion, the pinion turns 1 rpm and the pinion turns 3 turns around its own axis. Please think about it: If the gear does not move, the pinion will go through a circle around it and the pinion itself will turn a few revolutions. ⑤ When welding metal, it is often coated with zinc chloride, rosin or chlorinated (磠 sand), what is the use? ⑥ a boat for the anvils are made heavy, why? ⑦ cutting metal in the lathe, the cut chip thickness is always thicker than the cutting layer ?