This restaurant has become popular for its wide ______ of foods that suit all tastes and pockets.
A:division
B:area
C:range
D:circle
函数y=loga(2-ax)在0,1上是x的减函数,则a的取值范围是( )
判断下列图片与句子是否相符,用“正确”或“错误”表示。
It's half past nine.
( )
Ⅰ.将光亮铜丝插入浓硫酸,加热;
Ⅱ.待产生大量黑色沉淀和气体时,抽出铜丝,停止加热;
Ⅲ.冷却后,从反应后的混合物中分离出黑色沉淀,洗净、干燥备用.