單項選擇題
提攜角的正常角度是()
A.5°~30°
B.15°~20°
C.10°~20°
D.10°~30°
E.10°~15°
提攜角的正常角度是()
A.5°~30°
B.15°~20°
C.10°~20°
D.10°~30°
E.10°~15°