chemicals

1.Dyes come from plants or from chemicals.

染料是从植或化中得来的。

2.These chemicals are practically insoluble in water.

这些化乎不溶于水。

3.Have you studied the composition of the chemicals?

你研究过这种药品的成分了吗?

4.Semimetallic chemical element, chemical symbol B, atomic number 5.

半金属的化元素，化符号B，原子序数5。

5.We put chemicals in test tubes in our chemistry class.

我们上化课时把化药品放里。

6.The fission of the cell could be inhibited with certain chemicals.

细胞的裂变可以通过某些化药品加以抑制。

7.Certain chemicals are easily absorbed into the bloodstream, while others are not.

某些化药品很容易溶于血液, 有些则不行。

8.Now scientists have learned to make rain by salting clouds with certain chemicals.

如今, 科家已经掌握了把某些化撒在云层上以人工造雨的方法。

9.These chemicals make the fruit inedible.

这些化品使这种水果不宜食用。

10.As chemical reagent and corrodent of integrated plate.

作化剂和集成电路电镀板的消蚀剂。

11.The same water was reused after chemical treatment.

原来的水经过化处理之后再度使用。

12.Chemicals are used to keep the insects down.

化药品用于阻止昆虫滋生。

13.Choice having introduced the hammerhead and cleading chemical composition.

介绍了锤头和衬板化成分的选择。

14.What are the chemical reaction characteristics of tropane alkaloids?

氢溴酸东莨菪碱的鉴别原理是什么？

15.The chemical fertilizer should be well dug in.

化肥料应该均匀地混入土壤中。

16.Chemical modification including oxygenation, esterify, graft copolymerization and so on.

化改性主要有氧化、交联、酯化和接枝共聚。

17.The chemical must be salted out and allowed to dry.

必须把这种化加盐分离出来并让它变干。

18.The soil has been poisoned with chemical waste from the factory.

土壤被从工厂排出的化废料污染了。

19.The heat brings about a chemical reaction, and oxygen is liberated.

热量引起化反应, 释放出氧气。

20.A catalyst is a substance which speeds up a chemical reaction.

催化剂是一种能加速化反应的。