A.10~30 B.10~20 C.30~40 D.40~60
A.順時(shí)針30°~90° B.逆時(shí)針30°~0° C.逆時(shí)針30°~45° D.順時(shí)針30°~40°
A.50%~60% B.20%~50% C.20%~40% D.10%~20%