2. 外语
  3. Which TWO materials can be used as a substratum? A．oxygen-rich solution B．coconut fibre C．mineral wool D．rock

Which TWO materials can be used as a substratum? A．oxygen-rich solution B．coconut fibre C．mineral wool D．rock

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问题     Which TWO materials can be used as a substratum?
    A．oxygen-rich solution
    B．coconut fibre
    C．mineral wool
    D．rock
    E．paper fibre
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答案(outright) failure
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