原始生命诞生的场所是( )
A:原始陆地
B:原始大气
C:原始高山
D:原始海洋
—Yes. _________, Jack. We are late.
若f′(x0)=﹣3,则limh→0fx0+h-fx0-3hh=( )
--He refused a(n) answer. But I believe that he was against it.
下列图象能正确反映对应变化关系的是
如图,在所标识的角中,同位角是( )