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But the differences would go ____(未经报道的) since they would not surprise anyone.
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Both drove the same model blue Chevrolet, liked ____(木工手艺), chewed their fingernails, and owned dogs named Toy. Both started having late-afternoon headaches at the age of 18.
一对渐开线直齿圆柱齿轮的啮合线相切于______。
已知一渐开线标准直齿圆柱齿轮，齿数 z=25,齿顶高系数 ha * =1，齿顶圆直径 Da=135mm,则其模数大 小应为________。
.在一对渐开线直齿圆柱齿轮传动时，齿廓接触处所受的法向作用力方向_________。
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