A.60° B.50° C.40° D.45°
A.V帶輕微彎曲 B.彎曲應(yīng)力小 C.彎曲應(yīng)力大 D.V帶彎曲變化不大
A.5m/s~10m/s B.10m/s~15m/s C.15m/s~20m/s D.5m/s~25m/s