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- 1同学们已会使用普通光学显微镜了,你知道起放大作用的结构是( ) A.目镜和物镜 B.反光镜和目镜 C.反光镜和物镜 D.遮光器和反光镜
- 2设f(n)=2+24+27+210+…+23n+10(n∈N),则f(n)等于( ) A.27(8n-1) B.27(8n+1-1) C.27(8n+3-1) D.27(8n+4-1)
- 3一人数的8倍加上68等于80的百分之九十这个数是几
- 4一道经典椭圆题 用极坐标做
- 5The purse must be onne of the____(shop).Let's try___(find)him.
- 6What changes__ would he like__to see in his school(画线提问)
- 7二胡靠什么振动发声
- 8Come here,lily,i want ___.A some help B some helps C many help D many helps
- 9求有关环保的作文题目
- 10甲乙两车间人数比是3:5,若乙车间调进10人,现在甲乙两车间人数比是4:7,不变量是( ),列式( )