知乎，中文互联网高质量的问答社区和创作者聚集的原创内容平台，于 2011 年 1 月正式上线，以「让人们更好的分享知识、经验和见解，找到自己的解答」为品牌使命。知乎凭借认真、专业、友善的社区. Crankcase door 曲轴箱防爆门 crankcase explosion proof door 主轴承盖 main bearing cap 气缸盖罩 valve mechanism cover 飞轮壳 flywheel cover 扫气储器 scavenging air receiver 活塞 piston 裙部开槽. 活塞环 (piston ring) 是用于崁入活塞槽沟内部的金属环，活塞环分为两种： 压缩环 和 机油环。压缩环可用来密封燃烧室内的可燃混合气体；机油环则用来刮除气缸上多余的机油。活塞环是一种具有较大向.
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二、什么 是波前畸变（wavefront aberration） 波前畸变（wavefront aberration） 是指波前不再是理想的平面或球面，而是出现 局部起伏、扭曲、凹凸不平 等情况，从而引起相差。 像差 （aberration）.
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