问答题

Which of the following substance can NOT be found directly from an old ventilation system?
A．Chemical disinfectants.
B．Bacteria.
C．Fungi.
D．Pentachlorophenol.

A.Chemical
B.
B．Bacteria.
C．Fungi.
D．Pentachlorophenol.

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D．imminently

A.
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A.
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C.cool
D.warm