皮皮学，免费搜题
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【单选题】
气环的作用是保证活塞与气缸壁间的密封，防止高温、高压的（）漏入曲轴箱，同时将活塞顶部的热量传导到气缸壁，再由冷却液或空气带走。
A.
燃气
B.
汽油
C.
机油
拍照语音搜题，微信中搜索"皮皮学"使用
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