—What's the meaning of"One Belt and One Road"?
—Let me ________ the words in the new dictionary.
A:look at
B:look for
C:look after
D:look up
下列语句中下划线的成语使用有误的一项是( )
若函数f(x)=2sin(2x+π6)+a﹣1(a∈R)在区间0,π2上有两个零点x1,x2(x1≠x2),则x1+x2﹣a的取值范围是( )
1千米=____米,km表示____