锥齿轮的厚度尺寸由小端至大端逐渐(),齿形渐开线由小端至大端逐趋()
A.增大,弯曲
B.增大,平直
C.减小,弯曲
参考答案:B
Rather than________in the city, the old man would prefer______in the count、ryside.
A.stay; living
B.staying; to live
C.stay; to live
D.to st、ay; live
老年人运动锻炼时应遵循的原则。