（） of the A-frames there is a strong cast iron frame called the scavenging air box.<br>A:At the top<br>B:At the bottom<br>C:In the top<br>D:In the bottom

（） of the A-frames there is a strong cast iron frame called the scavenging air box.
A:At the top
B:At the bottom
C:In the top
D:In the bottom

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