【单选题】【消耗次数：1】
渐开线直齿圆柱齿轮的正确啮合条件是两轮的模数和（ ）必须分别相等
①
压力角
②
中心角
③
分度圆压力角
④
顶角
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渐开线标淮直齿圆柱齿轮正确啮合条件为[填空1]
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一渐开线直齿圆柱标准齿轮，已知齿数z=25，齿距p=12.566mm，压力角a=20。，齿顶高系数ha*=1，顶隙系数c*=0.25。分度圆直径（ ）。
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一渐开线直齿圆柱标准齿轮，已知齿数z=25，齿距p=12.566mm，压力角a=20。，齿顶高系数ha*=1，顶隙系数c*=0.25。齿轮的模数（ ）。
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