NOTE : Twin Disc Check Valves can be installed horizontally or in the vertical position with flow up .

注意： 双阀瓣 止回阀水平安装，或在流向朝上时垂直安装。

Objective : To discuss the advantages of molybdenum and rhodium twin target X-ray machine to check mammary gland ( the traditionally used is single target molybdenum X-ray machine ) .

目的探讨乳腺钼/铑 双靶X线机（传统的为钼单靶机） 筛查早期乳腺癌的优点。