几种散射机制同时存在,总的散射几率?
参考答案:
总散射概率等于多种散射概率之和。
如图,电阻R、电容C与一线圈连成闭合电路,条形磁铁N极接近线圈上端的过程中,流过R的电流方向和电容器极板的带电情况是
A.从a到b,上极板带正电
B.从a到b,下极板带正电
C.从b到a,上极板带正电
D.从b到a,下极板带正电
The __________ traffic stopped me from going to school on time yesterday. I was late![ ]
A. heavy
B. crowded
C. fast
D. quick