Look at the lovely dog. Guess _______ at birth. I think he might be 100 grams.
A:what could he do
B:what his weight was
C:what was his weight
D:what he could do
若椭圆x210+y2m=1与双曲线x-y2b=1有相同的焦点,且椭圆与双曲线交于点p103,y,求椭圆及双曲线的方程.
已知:2Zn(s)+O2(g)=2ZnO(s)△H=﹣701.0kJ•mol﹣1
2Hg(l)+O2(g)=2HgO(s)△H=﹣181.6kJ•mol﹣1
则反应Zn(s)+HgO(s)=ZnO(s)+Hg(l)的△H为( )