图中A为什么阀？http://www.worlduc.com/UploadFiles/HtmlImage/OnlineTest/2016-03-08/6359302207520312505755731.png
举一反三
- 这是（ ）顺序阀。http://www.worlduc.com/UploadFiles/HtmlImage/OnlineTest/2016-03-22/6359424139975000007004422.png
- 图中系统压力可以实现几级调压？http://www.worlduc.com/UploadFiles/HtmlImage/OnlineTest/2016-03-12/6359341396192187507849505.png
- 压力计3的读数是MPa。http://www.worlduc.com/UploadFiles/HtmlImage/OnlineTest/2016-03-12/6359341420932812509265046.png
- 系统压力能实现（ ）级调定。http://www.worlduc.com/UploadFiles/HtmlImage/OnlineTest/2016-03-12/6359341441764062504423490.png
- 图示为某切削机床的定位夹紧系统，溢流阀和顺序阀的调压压力关系是（ ）http://www.worlduc.com/UploadFiles/HtmlImage/OnlineTest/2016-03-22/6359424291254687502036687.png