A:why
B:where
C:that
D:because
—Chongqing is ____________ than ____________ city in the north of China.
—I think so. It's the hottest city ____________ the southwest of China.
写出带有下面偏旁的字。(各写两个)
氵:____ ____ 木:____ ____
亻:____ ____ 口:____ ____
辶:____ ____ 禾:____ ____
用托盘天平测物体质量前,调节横梁平衡时,发现指针在分度盘中线的左侧,这时应该( )
如图,An系列矩形纸张的规格特征是:①各矩形纸张都相似;②A1纸对裁后可以得到两张A2纸,A2纸对裁后可以得到两张A3纸,…,An纸对裁后可以得到两张An+1纸.
(1)填空:A1纸面积是A2纸面积的几倍,A2纸周长是A4纸周长的几倍;
(2)根据An系列纸张的规格特征,求出该系列纸张的长与宽(长大于宽)之比;
(3)设A1纸张的重量为a克,试求出A8纸张的重量.(用含a的代数式表示)