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【单选题】
已知发电机额定电压10.5kV，额定功率20MW，功率因数0.8，最大负荷利用小时Tmax=3200h。发电机引出线三相短路电流数据为I″=28kA，I tk/2 =22kA，I tk =20kA。短路电流冲击系数为1.8。继电保护动作时间为0.1s，断路器全开断时间为0.2s。三相母线水平布置，绝缘子跨距1.2m，相间距离0.7m，周围环境温度28℃。以此为条件，回答下列问题。 所选导体（2×（80×8）的铝矩形母线）计算短路时最高工作温度；（）。A.
100℃
B.
150℃
C.
65℃
D.
90℃
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反馈参考答案：
举一反三
【单选题】( )
A.
The job requires beginners to work hard.
B.
He enjoys working in the advertising company.
C.
His well-paid job requires a lot of hard work.
D.
He feels underpaid for he often works overtime.
【单选题】7
A.
He enjoys working in the advertising company.
B.
The job requires beginners to work hard.
C.
His well-paid job requires a lot of hard work.
D.
He feels underpaid for he often works overtime.
【简答题】A. She is affected by advertising. B. She likes shopping online. C. She enjoys playing s. D. She decides to save more money.
【简答题】A. The job requires beginners to work hard. B. He enjoys working in the advertising company C. His well paid job requires a lot of hard work. D. He feels underpaid for he often works overtimes.
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