A.20號(hào) B.18號(hào) C.15號(hào) D.10號(hào)
A.7057硅脂 B.89D制動(dòng)缸脂 C.潤(rùn)滑油 D.改性甲基硅油
A.φ30mm B.φ36mm C.φ40mm D.φ50mm