读“地上河”示意图,该图所示的景观,出现在( )
A:黄河上游
B:黄河中游
C:黄河下游
D:黄河入海口
对于方程:3x+2y=4,下列说法正确的是( )
读图,人均能源消费量最多的国家是( )
— Angela, I think your explanation can hardly satisfy our customers.
— I'm sorry, but I will explain it to them more clearly.
如果△ABC∽△DEF,其相似比为3:1,且△ABC的周长为27,则△DEF的周长为( )
6×____<58
8×____<65