原尿和血液相比,不含有的物质是( )
A:血细胞和大分子蛋白质
B:血细胞和葡萄糖
C:葡萄糖和大分子蛋白质
D:尿素和葡萄糖
如图,一张矩形纸片ABCD的长AB=a,宽BC=b.将纸片对折,折痕为EF,所得矩形AFED与矩形ABCD相似,则a:b=( )
多音字组词
bèi____ zhuàn____
背 转
bēi____ zhuǎn____
They're trying their best to enough money to build a school for the poor children.