No Plagiarism!T1vtSgk41ugGOSYXMDTKposted on PENANA 忘記寫氫氣不能裝入氣球,要用氦氣填裝喔!氦氣是惰性氣體,較穩定,但氦氣很貴,要從美國進口;反之,氫氣便宜易取得,但遇熱容易爆炸,就像日常遇到不好的事很容易爆氣~8964 copyright protection342PENANAbWSDhGcgwh 維尼
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