题目内容

( ) 4. The color suits the customer very well.

A. 对
B. 错

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( ) 5. The shop assistant finds a smaller coat for the customer.

A. 对
B. 错

( ) 6.The coat costs the customer 200 yuan.

A. 对
B. 错

( )7.The customer can pay in cash or by credit card.

A. 对
B. 错

半导体材料受到光照时会产生电子-空穴对，这种由光照引起的物体电学性能的改变，称为—————