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【单选题】
小心碰头！（）A.
Mind your head.
B.
Watch your head.
C.
Watch your step.
D.
Watch your walking.
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举一反三
【单选题】路由器上如何将当前运行的配置保存下来?
A.
write startup-config
B.
copy running-config startup-config
C.
write running-config
D.
copy running-config flash
【简答题】一平板电容器的电极面积A=0.05m 2 ，电极间的距离d=5mm，两极电压为U=200V，计算电极上的电荷、电容器的储能以及电极之间的作用力。
【单选题】对《灯下漫笔》理解有误的一项是( )
A.
鲁迅对中国人是充满同情的；
B.
作者极力描述了时局动荡的严酷与不确定性；
C.
中国人向来就没有争到过“人”的价值是作者的主要观点；
D.
作者极力描述了自己终于有一条退而求其次的路可走时的欣慰；
【多选题】Which of the following statement about concepts concerning sampling is/are true?
A.
Sample refers to a number of people taken from a larger group (i.e., population) and used to provide the information about the entire group.
B.
Sampling refers to the process of drawing a sample from a large research population.
C.
Census refers to procedure of systematically collecting information from every member of a given population.
D.
Sampling is the method used when the size of the population would render a census unfeasible and/or unnecessary.
E.
Representativeness means the extent to which the data obtained from the sample are true with the target population.
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