A.提高彈簧疲勞強度 B.避免彈簧發(fā)生共振 C.防止一根彈簧斷裂時氣閥落入氣缸 D.上述三點都是
A.0.5°~1° B.1°~1.5° C.1.5°~2° D.2°~2.5°
A.0.5~1mm B.1~1.5mm C.1.5~2.5mm D.2~3mm