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【单选题】
有限与无限有着本质的差别,有穷的开区间( - π /2, π /2 )中的点和无穷的区间( - ∞, + ∞)中的点的个数?A.
都是无穷的并且一样多
B.
都是无穷的并且（-∞，+∞）中的点多
C.
无法比较哪个中的点多
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反馈参考答案：
举一反三
【简答题】单相桥式半控整流电路，其主电路和触发电路工作都正常，当所带白炽灯泡灯丝被烧断后，用示波器观察晶闸管两端电压波形、二极管两端电压波形以及灯泡两端电压波形有何不同?
【单选题】When I opened the door, I found my father sitting in his chair, completely _______ in the humorous stories he was reading.
A.
absorbed
B.
applied
C.
attracted
D.
addicted
【简答题】我国金属货币的使用是从（）开始，战国时期大量使用。
【单选题】Read the sections 4.1 to 4.3 of the paper.The meanings of the four columns of Table 2 are explained in _________ ?
A.
the first paragraph of Section 4.1.
B.
the second paragraph of Section 4.1.
C.
notes to Table 2.
D.
nowhere in the article.
【单选题】Read the sections 4.1 to 4.3 of the paper.What is the function of 4.3?
A.
To confirm the validity of the results stated in 4.1 and 4.2.
B.
To address readers’ doubt that the effect of English as stated in 4.1 and 4.2 is driven by pairs in which one country is native English speaking.
C.
To support the main hypothesis of the present study.
D.
All of the above
【简答题】简述我国战国时期稷下学宫在管理上的特点。
【单选题】Were there any sections in it?
A.
Yes, it had 2 sections.
B.
Yes, it had many sections.
C.
Yes, it had 5 sections.
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