符合化工管路的布置原则的是()。
A.各种管线成列平行,尽量走直线
B.平行管路垂直排列时,冷的在上,热的在下
C.并列管路上的管件和阀门应集中安装
D.一般采用暗线安装
参考答案:A
I can ____ a lot ____ it. [ ]
A. learn, at
B. learn; for
C. learn; from
All ______, whether large or small, has never been lost sight of and is always appreciated by the Hope Project.
A.contribution
B.coincidence
C.conflict
D.convenience