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一、公 式 推 导 大多数活塞式空气压缩机的曲轴箱,缸体、阀及缸盖是各自分立的。它们之间由若干根双头螺栓连接起来（如图）。设曲柄的转角
First, the formula derived most of the piston air compressor crankcase, cylinder block, valve and cylinder head are separate. They are connected by a number of studs (Figure). Set the crank’s corner