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）. Plunger 产生的压力可达200mpa，piston 产生的压力最大150mpa。 短语 plunger piston 柱状活塞 plunger piston number 柱塞数目个 plunger piston push rod 柱塞姗精顶杆 活塞环 (piston ring) 崁入活塞槽沟的环，分为两种：压缩环和机油环。 压缩环可用来密封燃烧室内的压缩空气；机油环则用来刮除汽缸上多余的机油。 压力水箱盖 (pressure cap) 一种附有阀门的水箱.
Piston Cup Wiki 2017 at Alicia Christenson blog
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.
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