题目：
已知压力角α为20°的公制蜗杆，轴向摸数m=3，外径d=42mm，求牙型角d，中径d2，内径d1？
答案：
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参考答案：A解析： 信度代表测验结果的稳定性程度，效度代表了测验结果的准确性程度。
已知压力角α为20°的公制蜗杆，轴向摸数m=3，外径d=42mm，求牙型角d，中径d
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