—I agree. Then we can make computers _______ our lives better.
A:master; serve
B:to master; serve
C:to master; to serve
D:master; to serve
如图是“染色体、DNA分子和基因三者之间关系”的示意图,请据图回答
下列代数式的值中,一定是正数的是( )
如图,DE为△ABC中AC边的中垂线,BC=8,AB=10,则△EBC的周长是( )