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- 3x:8分之3=3分之2:4 x分之6=7分之2 x:0.3=0.4:0.8 1.75=6分之x
- 4A man and his wife had a dog to keep their house.When they went out,they always left the dog inside the house.
- 5教育人要积极向上,好上加好的诗句:( ),( ) 教育节约粮食,珍惜农民劳动成果的诗句:( ),( )
- 67.设S是至少含有两个元数的集合,在S上定义了一个二元运算“*"(即对任意的a,b∈S,对于有序元素对(a,b),
- 7将“一”读成第二声或第四声正确吗?
- 8若a的绝对值等于3,√b的平方=4且ab
- 9在Rt△ABC中,各边的长度都扩大2倍,那么锐角A的正弦、余弦值( ) A.都扩大2倍 B.都扩大4倍 C.没有变化 D.都缩小一半
- 10一个平行板电容器的电容C=500pF,极板间距离d=1*10的负二次方m ,使它带上Q=6*10的负7次方C 的电荷,求 1 、两极板间的电势差 2 、两极板间的场强大小