十、趣味实验1 辨别钮扣把所有钮扣都放在一只盛水的脸盆里 ,沉在盆底的是骨制的 ,浮在水面的是木制的。2 管中穿线在线的一头 ,缠上一块比管径小的石子 (或衣扣 ) ,将石子从管口放进 ,然后转动管子 ,使小石子借助重力作用 ,顺管子的另一端管口出来。3 拧瓶盖李明把瓶子慢慢 Ten fun experiment 1 to identify the buttons All the buttons are placed in a basin of water, sinking in the pelvic floor is bone, floating in the water is wooden. 2 pipe threading online one wrapped around a smaller than the diameter of the stones (or clothes button), the stones from the nozzle into, and then turn the pipe so that the gravel by gravity, the other end of the tube out of the tube . 3 twist bottle cap Ming bottle slowly