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问题:

[单选题]In a two-stroke engine, there are always a series of openings known as (), and in some circumstances, there are also openings known as (), in the part of the cylinder liner.

A、scavenging air ports;exhaust ports
B、inlet ports;scavenging air ports
C、scavenging air ports;inlet ports
D、exhaust ports;inlet port

参考答案: A

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