金属筒内装有与外界温度相同的压缩空气，打开筒的开关，筒内高压气体迅速向外逸出，待筒内外压强相等时，立即关闭开关。在外界保持恒温的条件下，经过一段较长的时间后，再次打开开关，这是出现的现象是？
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解析：
【单词】
My first letter is in wood but isn't in wolf
My second is in four and also in three,
My third is in music and also in tune,
My fourth is in May but isn't in June.
My whole makes a noise,
What am I?
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单词
最后修改于 2019-09-13 20:07:52
答案：
解析：
