有一个容量为45的样本数据,分组后各组的频数如下：(12.5,15.5］,3;(15.5,18.5］, 8;(18.5,21.5］,9;(21.5,24.5］,11;(24.5,27.5］,10;(27.5,30.5］,4.由此估计,不大于27.5
“过高的房价使许多购房者望而止步”说明了（ ） A.我国居民的收入过低 B.居民对住房的需求并不十分迫切 C.商品价格高低影响居民的消费选择 D.
用惰性电极电解物质的量浓度相同、体积比为1∶3的CuSO4和NaCl的混合溶液，可能发生的反应有( ) ①2Cu2＋＋2H2O2Cu＋4H＋＋O2↑ ②Cu2＋＋2Cl－Cu＋Cl2↑ ③2Cl
amol FeS与bmol FeO投入到VL、cmol/L的硝酸溶液中充分反应产生NO气体，所得澄清溶液成分可看作是Fe（NO3）3、H2SO4的混合液，则反应中未被还原的硝酸可能为
The sleepover（通宵派对）is so common in America.Usually,it reminds us of images of girls in clean nightclothes,having pillow fights,doing makeup and gossiping.I'll say this now:most sleepove
“学生罢课半月，政府不惟不理，且对待日益严厉。乃商界罢市不及一日，而北京被捕之学生释；工商界罢工不及五日，而曹、章、陆去。”材料反映
The victims fo the domestic violence, were often silent in the past, now choose to call for various helps. A ones B those C who
Tom is ___________ that he can’t go to school. A. so a young boy B. a so young boy C. a such young boy D. such a young boy
