A.垂直力 B.水平力 C.彎矩 D.轉(zhuǎn)矩
A.增大扭矩 B.降低轉(zhuǎn)速 C.轉(zhuǎn)變轉(zhuǎn)動方向 D.增大功率
A.15°-20° B.10°-15° C.20°-30° D.20°-25°