第一章测试1.Mixtures and pure substances can be separated by physical.（ ）
A:对 B:错
答案:A
2.Celsius is the unit of the temperature.（ ）
A:错 B:对
答案:B
3.Systematic errors caused by limitations in an experimenter's skill or ability to read a scientific instrument. （ ）
A:对 B:错
答案:B
4.In physical change, some of the physical properties of the sample may change, and its composition changed.（ ）
A:错 B:对
答案:B
5.There is a temperature at which °C and °F have the same value.（ ）
A:对 B:错
答案:A
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