108÷____=____
A.Where did you go over the winter holiday?
B.How tall are you?
C.Did you see a film last night?
D.You didn't come to school. What happened?
E.Are you all right?
⑴____ ⑵____ ⑶____ ⑷____ ⑸____
实验室用5%的NaOH溶液洗涤硝基苯以除去其中的酸性杂质,洗涤时不要用到( )
我国西部地区分布着众多的少数民族,右图邮票所示的少数民族集中分布在( )自治区.