瓷砖切割机的切割范围包括()。
A.陶瓷、陶土类砖
B.墙面砖
C.玻化砖
D.地砖
E.水泥类砖
参考答案:A, B, C, D
若函数f(x)=x2-4x+1在定义域A上的值域为[-3,1],则区间A不可能为[ ]
A.[0,4]
B.[2,4]
C.[1,4]
D.[-3,5]
Your advice would be()valuable to him, who is at present at his wits' end.
A.exceedingly
B.excessively
C.extensively
D.exclusively