2. 外语
  3. Choose THREE letters, A-G. Write your answers in boxes 7-9 on your answer sheet. Which THREE of the following seven piec

Choose THREE letters, A-G. Write your answers in boxes 7-9 on your answer sheet. Which THREE of the following seven piec

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问题     Choose THREE letters, A-G.
    Write your answers in boxes 7-9 on your answer sheet.
    Which THREE of the following seven pieces of safety equipment are suggested for use with a hot air balloon?
    A．Drop line
    B．Gas valve
    C．Piezo ignition
    D．Synthetic clothing
    E．Fire-proof gloves
    F．Flint spark lighter
    G．Propane combustion
Frequent ______ is important: fixing or changing faulty parts of the propulsion system when necessary.
选项
答案maintenance
解析
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