若函数f(2x)的定义域是[-1,1],则f(log2x)的定义域是( )。
[,4]
They have ______ most carefully the time and money needed to complete the project. [ ]
A. pick out
B. left out
C. figured out
D. taken out
混合的目的是使()尽可能的均匀。
A、水分
B、煤样
C、粒度