A:Mg(OH)2不溶于水,但能溶于浓NH4Cl溶液中
B:水垢中含有的CaSO4,先用Na2CO3溶液处理,使之转化为疏松、易溶于酸的CaCO3,再用酸除去
C:洗涤BaSO4沉淀时,用稀硫酸洗涤BaSO4沉淀比用蒸馏水洗涤损失少
D:FeCl3溶液中混有FeCl2,常加入少量的H2O2,使Fe2+氧化为Fe3+
单词分类。请将单词或短语按要求分类,(只写序号)1 read comics 2 chew gum 3. short 4 get up early 5 medium build6 play on the swim team 7 sleep with light on 8 play games 9 straight hair 10 heavy 11 watch TV 12 thin 13 paint pictures 14 attend gym class 15 eat candy(1)容貌外表____ (2)生活习惯____ (3)活动爱好____
依据生物的某些特征,对生物分出如图三个类群,下列描述错误的是( )
__________ the children have fun, parents can take dance lessons on the beach.
人体完成伸肘动作,肌肉的配合情况是( )