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剪下 1个橡皮手套的指头 ,剪掉指端的封闭部 ,使之成为两头开口的橡皮管。把管的一端用橡皮筋缚在一去底的眼药水瓶的底部 ,加红墨水稀释液于眼药水瓶内 ,如图所示。橡皮管的另一端套入食指 ,并结扎不使漏水。片刻后就能观察到由脉搏搏动而引起的瓶内液体上下浮动。液体上下浮?
Cut off the finger of a rubber glove and cut the closed end of the finger to make it a rubber tube with two open ends. Attach one end of the tube to the bottom of a bottomed eyedropper with a rubber band and add a red ink dilution to the eyedropper as shown. Rubber hose into the other end of the index finger, and ligation does not make leakage. After a moment you can observe the fluctuation of the liquid in the bottle caused by the pulsation of the pulse. Liquid up and down?