The most common method of determining maximum differential pressure across the valve seats is to assign the maximum design or operating pressure the upstream value p1 and assume a downstream pressure p2 of 0 psig 测定阀门阀座的最大压差的最常用方法是将最大设计或工作压力作为上游的压力值p1 ，然后假定下游压力值p2为0psig
These rapscallions wanted to try the nonesuch again , because there was so much money in it , but they judged it wouldn t be safe , because maybe the news might a worked along down by this time 这两个流氓又想演出王室异兽那一套，因为这能捞到大钱。不过他们也认定不安全，因为时至今日，上游的消息传闻，也许已经一路传开了。
Unfortunately the upstream security policy is to urge users to update to new upstream versions , which conflicts with debian s policy of not shipping large functional changes in security updates 但很不幸的，它的上游的安全策略就是鼓励使用者升级到新的版本。这和debian尽量不要在安全更新里提供太多功能上的变化的政策是相互?触的。
As a scientist who has worked on this topic for some years , it is my judgment that 80 to 95 percent of the direct sediment contributions into the headwaters of these rivers are now attributable to road erosion and landslides 作为一名曾在该领域工作多年的科学家，我判定，这些水系上游的直接泥沙排放量中，有80 %到95 %来自于道路侵蚀和滑坡。
The first luxurious cruiser on nenjiang river launches in qiqihar , northeast china ' s heilongjiang province , august 6 , 2007 . it measures 29 . 3 meters long , 8 . 4 meters wide and can carry 150 passengers 8月6日，嫩江航线第一艘豪华游轮在黑龙江省齐齐哈尔港下水。它将主要在嫩江上游的明月岛风景区航行。这艘游轮长29 . 3米，宽8 . 4米，可载游客150人。
( 6 ) the destroying of the barrier dam can result in the change of the lower environment . so protecting the upper environment is not only the necessity to the development itself , but the key to the lower environment ( 6 )堰塞坝体的溃决引起岷江下游环境的变化，因此保护好岷江上游的生态环境不仅仅是上游本身发展的需要，也是岷江中下游环境好坏的关键。
In order to explain the special function of the genome , hem refers a new method which can conclude the function of the gene through analysis to the cis - regulatory elements in upstream of the core promoters 摘要为了实现基因组中特定基因功能的注释，研究者提出一种新的思路，即利用对目的基因启动子上游的顺式元件的功能的分析，进一步来推断目的基因的功能。
And it is pointed out in this paper that it is the best choice to take the pattern of exploying resources and protecting ecological environment simultaneously to ensure the sustainable development 针对岷江上游的实际情况，论述森林植被的恢复与保护在生态环境建设中的作用。提出采取资源开发和生态环境保护并重的发展模式是实现岷江上游可持续发展的最佳选择。
Almost four million people in harbin in northeastern china are expected to be without running water until late saturday after a chemical plant explosion on nov . 13 contaminated the upper reaches of the nearby songhua river with toxic benzene 在中国东北部的城市哈尔滨，大约四百万人周六以前没有活水，因为11月13日上游的一个化工厂发生爆炸，河水遭到了苯污染。
