第八章单元测试
- For the composition of Air, oxygen's volume percent is 20.95%。（ ）
- Nitrogen can be used as refrigerant.（ ）
- Oxygen can be used for metals and water treatments.（ ）
- The transformation of oxygen into ozone is an exothermic reaction. （ ）
- Hydrogen is a unique element that does not fit into any group. Hydrogen can‘t occur as in aqueous solutions and as in hydrides. （ ）
A:对 B:错
答案:对
A:错 B:对
A:错 B:对
A:对 B:错
A:错 B:对
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