问题
问答题 简答题
写出复合型水处理剂的优点有什么?
答案
参考答案:
①其中缓蚀剂与缓蚀剂之间,缓蚀剂与阻垢剂之间往往存在协同作用或增效作用。
②可以同时控制多种金属材质的腐蚀。
③可以同时控制腐蚀与水垢或污垢的形成。
④可以简化加药的手续。
写出复合型水处理剂的优点有什么?
参考答案:
①其中缓蚀剂与缓蚀剂之间,缓蚀剂与阻垢剂之间往往存在协同作用或增效作用。
②可以同时控制多种金属材质的腐蚀。
③可以同时控制腐蚀与水垢或污垢的形成。
④可以简化加药的手续。
选词填空(用适当形式)。 | |
2. The troubled country was _____ medicine. 3. Don't give up. Try it _____ ! 4. The manager asked me to ____ the man outside her office. 5._____, young women like it better than older women. 6. I____ with some Russian friends. 7. She ____ an experienced actress. 8. She ____ what he said, careful not to miss a word. 9. His most important strategy is to____before he places a call. |