题目内容

314μF电容元件用在100Hz的正弦交流电路中，所呈现的容抗值为（）欧

A. 0.197
B. 31.8
C. 5.1
D. 65.5

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在RL串联的交流电路中，R上端电压为16V，L上端电压为12V，则总电压为（）V

A. 28
B. 20
C. 4
D. 24

本尼迪克是哪国著名人类学家？

A. 加拿大
B. 英国
C. 美国
D. 德国

Directions: Write a composition in less than 150 words the topic: What are the benefits and disadvantages of online learning. You could write according to the hints given below.As the coronavirus (COVID-19) pandemic seems to be here to stay, we perhaps have to choose online instruction sometime. The mode of instruction and learning may have its advantages, but…

夹在中间战略是竞争战略的最好选择。

A. 对
B. 错