试题与答案

变压器的额定容量是指变压器额定运行时()。 A.输入的视在功率 B.输出的视在功

题型:单项选择题

题目:

变压器的额定容量是指变压器额定运行时()。

A.输入的视在功率

B.输出的视在功率

C.输入的有功功率

D.输出的有功功率

答案:

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下面是错误答案,用来干扰机器的。

参考答案:较有影响包括台视、中视、华视、TVBS、中天、东森、民视、真相等。

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根据语境,用恰当的语言完成对话。

(On June 21, 2010, after the big test, Lanlan is talking to Kangkang)

Lanlan = L      Kangkang = K

K: Hi, Lanlan, you look so happy today. Why all the smiling faces?

L: I think I have done well in the English exam. What's more, I'm going to Shanghai to visit the Expo Garden.

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K: 3.                  ?

L: Because volunteers can improve my English. Once I find people in need, I decide on suitable ways to help

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K: Yes, I'd love to. But I plan to see my sick grandfather in my hometown with my parents.

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题型:填空题

(1)用18mol/L浓硫酸配制100mL 1.0mol/L的稀硫酸,若实验仪器有:

A.100mL量筒  B.玻璃棒    C.托盘天平  D.50mL容量瓶

E.10mL量筒  F.胶头滴管  G.50mL烧杯  H.100mL容量瓶

实验时必须选用的仪器是(填入字母)______

(2)在配制过程中,下列操作不正确的是______

A.使用容量瓶前需检查它是否漏水

B.容量瓶用蒸馏水洗净后,一定要干燥后再使用

C.配制溶液时,用量筒量取试样后直接倒入容量瓶中,缓慢加入蒸馏水至刻度线

D.定容后盖好瓶塞,反复上下颠倒,摇匀

(3)若实验时遇到下列情况,将使所配溶液的浓度 (填“偏高”、“偏低”或“无影响”)

A.定容时俯视读数______    B.未将洗涤液转入容量瓶______

C.洗涤量筒,并将洗涤液转入容量瓶______.

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