供用电设施计划检修时,对35KV及以上电压供电的用户的停电次数,每年不应超过(A)次;对10KV供电的用户,每年不应超过( )次。
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氯丙嗪对哪种病症的疗效最好
A. 抑郁症
B. 精神分裂症
C. 焦虑症
D. 精神紧张症
E. 其他精神病
设函数f(x)=x2(x-1)(x-2),求f′(x)的零点个数为()。
A. 0
B. 1
C. 2
D. 3
According to the author, the following are the function of a junior and community college except ______.
A. it can help you become better equipped to continue education
B. it can help you to learn to face the challenges in life
C. you will learn how to think and learn
D. you will have decision-making classes
专线用户,用户进线侧有保护,在发生内部事故中造成变电站出线开关跳闸,应称为( )。
A. 用户事故
B. 用户影响系统事故
C. 线路停电事故