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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。

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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。

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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

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

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

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Which of the following statements is not true about "private traffic"?

A. Influencer marketing is a kind of "private traffic".
B. It makes quality control very difficult.
C. It can refer to businesses that are done through private WeChat accounts.
D. It can put an end to counterfeit products.

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