题目内容

平衡状态的PN结宽度不变,此时多子的扩散和少子的漂移运动都停止。( )

A. 对
B. 错

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4 Listen to a dialogue and decode the message by finding the correct choices inbrackets according to what you have heard.Mr. Anderson is shopping at a department store. He wants to buy some (1 silk, pottery, jewelry) . He asks the shop assistant for something a little (2 darker, brighter, lighter ). The assistant shows him the design with blue and yellow (3 birds, cats, dogs) . He likes the (4 color, size, design) and wants to buy one and half meters for his (5 wife, sister, daughter) to make a short-sleeved dress. It will cost him (6 one hundred and fourteen,, one hundred and four yuan).