废水为什么要循环利用?
参考答案:
一可以减少废水外排污染环境;
二可以节省大量处理费用;
三可节约用水;
四可回收废水中的有用物质。
You look well. The air and the sea foods in Sanya must _____ you, I suppose. [ ]
A. agree with
B. agree to
C. agree on
D. agree about
如何运用测量法、测试法检查机车?