A:向试管内加锌粒
B:倾倒液体药品
C:给试管内的液体加热
D:用橡胶塞塞住试管
已知函数f(x)=1+x-x22+x33-x44+...+x20132013,设F(x)=f(x+4),且函数F(x)的零点均在区间a,b(a<b,a,b∈Z)内,圆x2+y2=b-a的面积的最小值是 ( )
It was commanded that the coal mine survivors ____ to the nearest hospital for treatment.
This is a picture _____ my room.