第四章

Chapter 4 Inorganic Non-metallic Materials

1. 单选(2分)

‏ ______is not the property of inorganic non-metallic materials.

‏A. strong chemical resistance

B. low melting temperature

C. no free electrons

D. more complicate crystalline structure than metals

2. 多选(3分)

‌______are the chemical bonds in inorganic non-metallic materials. 

‎A. metal bonds

B. pure covalent bonds

C. mixed bonds

D. ionic bonds

3. 多选(3分)

Choose the general properties of ceramics from the following

‌A. Wear-resistant

B. Magnetic

C. Oxidation resistant

D. Hard

4. 多选(3分)

Which are correct in the following options?

‌A. The ordinary ceramic is not transparent because they absorb lights and cause light scattering.

B. The ordinary ceramic is not transparent because they contain gas cavity.

C. The ordinary ceramic is not transparent because they are made of ultra pure raw materials.

D. The ordinary ceramic is not transparent because they contain impurities.

5. 判断(2分)

‏The glass have various colors because they contain different metals or rare earth metals. 

正确

6. 判断(2分)

‍Inorganic non-metallic materials have higher thermal conductivity than metals.

错误