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- 1积分[secx(tanx-secx)+5^* e^x]dx
- 2Thay say that Mr Liu can speak German .
- 3把这些句子变成否定,一般疑问句,再对划线部分提问.
- 4一个长方体如果高增加2厘米,就变成一个正方体,这时表面积比原来增加56平方厘米,原来长方体的体积是多少
- 5It is required that all woule-be employees___ citizens of this country.
- 6I have _____food for lunch
- 7背影 课后题第三问
- 8--Do you think that everyone in our class e______ the weekend?--I think most of them h____ a good time.
- 92CrO3+3C2H5OH+3H2SO4=Cr(SO4)3+3CH3CHO+6H2O 浓度为133mg/100ml的酒精转移电子的物质的量
- 10一项工程,甲单独做5天完成,乙单独做4天完成,如果乙单独做2天后交由甲做,甲完成整个工程还要用()天.