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【多选题】
PN 结 (PN Junction) 的形成 正确的是A.
载流子的 浓度差 引起多子的 扩散
B.
复合使交界面 形成空间电荷区
C.
扩散和漂移达到 动态平衡
D.
PN结形成以后就导通
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【简答题】小车的电机减速后转速300rmp,当车轮直径为50mm时,每秒钟速度为300/60=5转/秒,车轮转一圈的周长为3.14159*50=157mm,试求小车行走的速度(m/s)?
【单选题】The rules about business meals we learned in today's class may _______ in future.
A.
come in handy
B.
come at handy
C.
useful
D.
come in handing
【简答题】When it comes to eating out, we can't help thinking of big meals in the restaurants, which usually contain much more fat and less fibers. Whether it is a business meeting over lunch or a fast food mea...
【单选题】What do we learn about McDonald ’ s inclusion of toys in its Happy Meals?
A.
It may shed light on people ’ s desire to crack a secret.
B.
It has proved to be key to McDonald ’ s business success.
C.
It appeals to kid ’ s curiosity to find out what is hidden inside.
D.
It may be a pleasant way for kids to reduce their food intake.
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