当x=( )时,3x+1的值与x+1的值相等.
0
All the other boys have geography books and they will be ahead of me if I don’t get ______.
A.it
B.the one
C.one
D.that
反映投资方案盈利能力的动态评价指标有()。
A.投资收益率
B.内部收益率
C.净现值率
D.利息备付率
E.偿债备付率