题目内容

4 ___ A Technology is a type of machine that makes life easier.

A. 对
B. 错

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___ B Physics is the art of using the knowledge gained by science.

A. 对
B. 错

5 ___ A A machine is a device that has multiple parts and does work.

A. 对
B. 错

___ B A discipline is a person who applies scientific knowledge.

A. 对
B. 错

下列化合物中,与氖原子的电子构型均相同的正离子和负离子所产生的离子型化合物是( )。

A. NaCl
B. MgS
C. NaF
D. CaCl2