A:蜡烛+氧气→水+二氧化碳
B:氧化汞→汞+氧气
C:氧化钙+水→氢氧化钙
D:氢气+氧气→水
圆锥曲线x2m+y2=1的离心率为7,则m=( )
下列对中国公民认识正确的是 ( )
The upset mother thought to herself, “If only I ______ what's going on in my little boy's head right now.”