A:If you have a talk with Sara
B:Having a talk with Sara
C:Have a talk with Sara
D:After having a talk with Sara
体积为3×10﹣4米3的金属块浸没在水中.
求:(1)该金属块排开水的体积V排.
(2)该金属块所受到的浮力F浮.
下列符号中,既能表示氢元素,又能表示氢原子的是()