如图所示是某电源的路端电压与电流的关系图像，下面结论正确的是

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问题不定项选择

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A．电源的电动势为6.0 V

B．电源的内阻为12 Ω

C．电源的短路电流为0.5 A

D．电流为0.3 A时的外电阻是18 Ω

答案

填空题

综合填空。

看下面家谱，补全短文，每空一词。

Look at my 1 tree, please. I am Mike. I'm from the U.S.A. I have a big happy family. My wife

(妻子) 2 is a nurse. We have 3 kids. 4 is our son and Joy is our 5 . They study

at No.1 High School. My father's name is Bill and my 6 name is Hellen. My 7 are old. John is

my 8 . He is a doctor. Kate is my wife's 9 . She is a worker. My wife's 10 name is

Emma. My wife's father's name is Peter. They're old, too. They stay at home.

单项选择题

标准长度为1670㎜的压型制品，验收的最短尺寸为（）㎜。

A、1625

B、1630

C、1655

D、1660