题目内容

一个在周期场中运动的电子波函数为一个与一个的乘积。

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单电子近似又称，是将每个电子的运动看成是的运动。价电子的等效势场包括，以及。

布洛赫波函数是的行波，这在物理上反映了晶体中的电子既有的倾向，又有的特点。布洛赫函数的平面波因子描述运动，而周期函数的因子描述运动，这取决于。

Directions: Watch the video and choose the best answer accordingly.1. According to the female interviewee Zhu Mei, the first thing she considers in her online shopping decisions is ________.

A. low price
B. good quality
C. reviews from real buyers
D. recommendations from retailers

According to the male interviewee Alexander Farmer, counterfeit products are usually of ________.

A. low quality
B. reasonble price
C. good source
D. high reputation