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- 2用单词的适当形式填空 If you think you can _______(success),then you can.
- 3求原函数：dz=(2xcosy-y2sinx)dx+(2ycosx-x2siny)dy
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- 5A resident spotted a man __in his car ___the explosion and called the police.
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- 8tom was played basketball yesterday.此句中的was用加吗
- 9如图所示，开关S断开时，电灯正常发光，消耗的功率为P； 若把电源电压提高到原来的两倍，同时闭合开关S，使电灯的功率变为14P，则电流表示数为原来的（ ） A.2倍 B.4倍 C.12倍 D.14倍
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