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题2．1．12图所示的是直流电动机的一种调速电阻，它由四个固定电阻串联而成。几个开关的闭合或断开，可以得到多种电阻值。设四个电阻都是1Ω，试求在下列三种情况下a、b两点间的电阻值：(1)S1和S5闭合，其他断开；(2)S2、s3和s5闭合，其他断开；(3)s1、s3和S4闭合，其他断开。
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举一反三
【单选题】As we know, nothing can be equal to the ______ of parents for their children in the world.
A.
appreciation
B.
intention
C.
invitation
D.
affection
【单选题】If you write something and it isn’t very good, you should _______ it. [ ]
A.
repeat
B.
recite
C.
redo
D.
rewrite
【单选题】The reference she made to her friend, the poet, was interesting but too _____ for anyone to appreciate.
A.
drastic
B.
dull
C.
obscure
D.
distinct
【单选题】下面那个库函数是获取复位ADC校准状态的()
A.
FlagStatus ADC_GetResetCalibrationStatus(ADC_TypeDef* ADCx);
B.
void ADC_StartCalibration(ADC_TypeDef* ADCx);
C.
FlagStatus ADC_GetCalibrationStatus(ADC_TypeDef* ADCx);
D.
以上都不是
【简答题】I am a writer. My job is to write something for the newspaper. I work very hard. Every morning I get up at seven. I take some exercise and then have a light breakfast. Then I drive to my office. It ta...
【简答题】write something very quickly and carelessly v.
【单选题】Have you ever dreamed of staging a concert, ________ thousands of people are applauding and appreciating your music?
A.
at which
B.
when
C.
for which
D.
which
【简答题】boost a. write something down b. want to know about something c. very interested in sth d. display sth e.obtain f. television, TV, internet, press g.improve, increase h.ahead of time i.who is present ...
【简答题】curious a. write something down b. want to know about something c. very interested in sth d. display sth e.obtain f. television, TV, internet, press g.improve, increase h.ahead of time i.who is presen...
【简答题】gain a. write something down b. want to know about something c. very interested in sth d. display sth e.obtain f. television, TV, internet, press g.improve, increase h.ahead of time i.who is present a...
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