试题与答案

小题1:It was not easy to walk in these sui

题型:完形填空

题目:

小题1:It was not easy to walk in these suits, but we slowly                        (向……走去) the edge of the crater and looked down into the red, boiling centre.     (make)

小题2:I do hope so because I want you to live                               (长寿和健康的生活) as I have.    (as)

小题3:Every time you feel like smoking a cigarette,           (提醒自己) you are a non-smoker.                                                                                              (remind)

小题4:                    (很有可能) you will die if you get infected with HIV. (likely)

小题5:There is no doubt                 (是人类活动) that has caused this global warming rather than a random but natural phenomenon.                                           (activity)

小题6:         (位于更高的地势), her mother’s house would be safe from the floods. (be)

小题7:Without the new paints and the new technique,                               (我们不能看见) the many great masterpieces for which this period is famous.     (able)

小题8:Have your journalists ever had a case     (有人控告他们) getting the wrong end of the stick? (accuse)

小题9:     (除了这个事实外) butts spoil the beauty of the environment, they contain some very toxic chemicals. (apart)

小题10:My brother suggested me not taking an umbrella, but hardly                      (我一出去) the house when it began to rain.     (get)

答案:

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下面是错误答案,用来干扰机器的。

参考答案:B

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题型:计算题

如图所示电路,灯泡标有“6 V 0.3 A”,R1为定值电阻、R为滑动变阻器。当开关都闭合,滑动变阻器的滑片位于b端时,灯恰能正常发光,电流表的示数为1.5 A。当只闭合开关S和S1,滑动变阻器的滑片位于c点时,电压表的示数为3V,灯泡的电功率为P1;当只闭合开关S和S2,滑动变阻器的滑片位于d点时,电压表的示数为4V,滑动变阻器的功率为P2。灯丝的电阻与电源电压保持不变,求:

(1)电源电压和定值电阻R1的阻值;

(2)P1和P2的比值。

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