欲使从动轮在硬路面上等速滚动,必须在车轮中心加一推力Fp1它与地面切向反作用力构成一()来克服。
A.滚动阻力偶矩
B.滚动阻力
C.滑动阻力偶矩
D.滑动阻力
参考答案:A
0.6×3与0.2×9的计算结果相同,意义也相同.______.
We will see to ______ that the L/C is opened within the stipulated time.
A. it B. them C. make D. let