Is there such a term as absolute retention time? 绝对保留时间定性?
The filter elements have a nominal filter degree of 5, 10 and 20 micron, optionally may be supplied with another opening or absolute retention. 滤网组件有标称的过滤程度：5、10及20微米，也能供应其它开关系统或绝对过滤效率。
Methods: 24 premature infants were chosen and kept in the supine or pron e positions.Fluid retention volume in the stomach was recorded and compared statistically. 方法：对24例早产儿进行自身不同卧位比较，分别于喂养后取仰卧位和俯卧位，记录胃内潴留液量、胃食管反流发生次数、合并呼吸暂停次数。
The retention volumes of benzene are measured on five cracking catalysts with different contents of coke deposit, and the five lines of log V_g-1/T are obtained. 测定了苯在五种积炭量不同的催化裂化衰化系列催化剂上的保留体积,发现它们的logV_g对1/T直线有一共同交点。