在0.5mol Na2SO4中,含有的Na+数约是( )
A:3.01×1023
B:6.02×1023
C:0.5
D:1
—Will you please tell us how you can seize the robbers?
—I will spend a whole week ________in your room to wait for their coming.
钓鱼岛是中国的固有领土,位于中国东海,面积约4400000平方米,数据4400000用科学记数法表示为( )