渐开线直齿圆柱齿轮正确啮合的条件是1.(          )相等和2.(          )相等。(用文字表达)

【参考答案】

\n \n \n \n (1)\n \n 两轮的模数\n \n \n \n (2)\n \n 两轮的分度圆压力角\n \n \n \n \n