According to the passage, the maximum intensity of sound coming from commercials ______.
A. does not exceed that of programs
B. is greater than that of programs
C. varies over a large range than that of programs,
D. is less that that of programs
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长期应用引起角膜褐色微粒沉着的抗心律失常药是
A. 利多卡因
B. 胺碘酮
C. 维拉帕米
D. 奎尼丁
E. 普萘洛尔
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。
A. 1
B. 2
C. 3
D. 5
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