third class(grade) pressure vessel

 
  • 三類壓力容器
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third class(grade) pressure vessel的英文翻譯是什麼意思,詞典釋義與在線翻譯:

英英釋義

名詞 third class:
  1. mail consisting of printed matter qualifying for reduced postal rates

  2. inexpensive accommodations on a ship or train

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