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【判断题】

There are indications of an earlier Xia Dynasty, but the Shang were the first dynasty to leave written records .

A.
正确
B.
错误
举报
参考答案:
参考解析:
.
刷刷题刷刷变学霸
举一反三

【单选题】影响传动侧隙的加工误差有(AD )。

A.
基节偏差
B.
齿向误差
C.
齿圈的径向跳动   
D.
公法线平均长度偏差