A.短而輕 B.長(zhǎng)而重 C.寬而短 D.細(xì)而輕
A.防噴管 B.注脂泵 C.泄壓閥 D.采油樹閥門
A.2~5mm B.0.1~0.15mm C.0.15~0.3mm D.0.2~0.3mm