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大、中模数齿轮经高頻淬火后检查硬度时,为什么要以端面硬度为准?张先鸣每当坩堝里的铝液加入一包(分3～4次,食盐后,铝
Large, medium modulus gear after the high frequency quenching check the hardness, why should the end hardness prevail? Zhang Xianming whenever the crucible in the aluminum liquid to join a packet (points 3 to 4 times, after the salt, aluminum