题目: 下列各项中物质的类别不正确的是( )ABCDAl2O3SiNa2O2Na2SiO3两性氧化物单质碱性氧化物硅酸盐 答案: 答案:C碱性氧化物是指与酸反应生成盐和水的氧化物,Na2O2为过氧化物,与酸反应除了生成盐和水,还生成氧气,C错误。点拨:本题考查物质的分类,考查考生对基本概念的理解。难度较小。
题型:解答题 根据实验“显微镜的使用”和“观察植物细胞”回答:1)写出图中下列标号的名称:③______④______2)图A中,①的放大倍数为5倍,②的放大倍数为10倍,则这台显微镜能将物像放大______倍.3)孙悟同学要在玻片上写一个______字,其在显微镜下的物像如图C所示.要想更好的观察C图中的物像,则应朝______方移动玻片. 查看答案
题型:选择题 The old man said the accident________careless driving, so a lot of money________be paid by the driver.[ ]A. was due to; was due toB. due to; was due toC. is due to; has due to D. is due to; was due to 查看答案