At the top of the A-frames there is a strong cast iron frame called （）.<br>A:cylinder liner<br>B:cylinder cover<br>C:the gear box<br>D:the scavenging box

At the top of the A-frames there is a strong cast iron frame called （）.
A:cylinder liner
B:cylinder cover
C:the gear box
D:the scavenging box

出自：海船船员证

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