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问题:如图1所示,4支相同的试管内装有不同高度的水,请按下列步骤动手做一做,然后填空。(1)用嘴贴着管口吹气,发出的声音由低到高的顺序
Problem: As shown in Fig. 1, four identical tubes are filled with water of different heights. Please follow the steps below to do one thing and fill in the blanks. (1) Blow mouth with mouth against the mouth of the mouth, the sound from low to high