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读短文，选答案。 Usually I go to school on foot but this morning I went to school by bus, because I got up late. My best friend Mike didn't come to school today. He went swimming yesterday and had a cold. The doctor asked him to stay in bed and take some medicine. After class, John and I went to visit Mike. He is much better. I hope he can go to school tomorrow. 1. I usually go to school . A. by bus B. on foot 2. I went to school by bus this morning because _ . A. I got up late B. I had a cold 3.Mike _ yesterday. A. went shopping B. went swimming 4. John and I went to . A.the hospital B. visit Mike 5. How does Mike feel now? A. He is angry. B. He is better.
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【简答题】图示电路中,已知电源电压 u =220 sin314 t V , R =11Ω , L =211mH , C =65μF 。请回答问题6-问题11 。 (答案保留小数点后一位) 电路的总阻抗 Z 的阻抗模为 Ω 。
【简答题】已知电源电压u=220 Sin(314t-60°)V,电路中电压最大值Um=(
)V;角频率W=( )rad/s;初相Φu=( )。
【单选题】已知在对称三相电源中，U相电压为u=220sin314tV，则V相和W相电压（ ）
A.
v= 220 sin(314t+ ) V ，w= 220 sin(314t- ) V
B.
v= 220 sin(314t- ) V ，w= 220 sin(314t+ ) V
C.
v= 311 sin(314t- ) V ，w= 311 sin(314t+ ) V
D.
v= 220 sin(314t- ) V ，w= 220 sin(314t) V
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