单词：mechanical seal with high back pressure
单词：mechanical seal with high back pressure 相关文章
This morning the jackass penguins are out early. This species is unique to Africa, but they are insulated like other penguins. Trapped in winter wear all year long, they get hot easily. And make their way to the water before the sun is high over head
国家地理2007年
By Carol Pearson Washington 22 August 2007 High blood pressure, or hypertension, is a disease usually associated with adults, but children can get it too and can have serious health problems because of it. A new study is now calling for pediatricians
2007年VOA标准英语（八月）
VOA常速英语2014--High Blood Pressure in Young Adults Could Lead to Heart Disease 青年时血压高能导致心脏病 February is heart health month, and a new study that provides clues to young people about keeping their hearts healthy. The stud
VOA标准英语2014年(二月)
Mechanical problem 2 机械故障2 A: Why have you stopped production? A:你为什么停产？ B: We've had a few problems. One of the bolts has worked loose and a blade has snapped off. B:有点问题。有个螺栓松了，一个刀片折断了。
职业技术英语口语
A: Have you been feeling OK lately? B: My coach wants you to check my blood pressure. A: Has anyone ever told you that you had high blood pressure? B: I dont have any symptoms of high blood pressure. A: People with high blood pressure seldom know the
英语情景对话-健康
By Melinda Smith Washington 12 September 2007 A recent study indicates that a disturbing number of American children with high blood pressure go undiagnosed. The study has prompted discussion worldwide about whether hypertension among children is jus
2007年VOA标准英语（九月）