“毛细管”的英语？

汽油检测系统由毛细管节流器组成.The gasoline detection system consists of a capillary restriction.这由一根与汞池相连的毛细管所构成.This consists of a capillary connected to a mercury reservoir.双毛细管比重瓶是一种用于精确测量液体密度的仪器.The bicapillary pyonometer is a too...