渐开线齿廓上任意点的法线都不相切于()。
A.分度圆
B.基圆
C.节圆
D.齿根圆
参考答案:A, C, D
《大医精诚》的作者是()
A.刘完素
B.孙思邈
C.张仲景
D.林逋
E.李时珍
She won’t leave the TV set, ____ her husband is waiting for his supper.
A.as though
B.even though
C.whether
D.whenever