题目

Would you mind if I played the violin here? —          A．No, you won't                              B．No, do as you please C．Yes, I don't mind                          D．Yes, do as you please 答案：B2．弹簧测力计挂着一个质量为890克，密度为8.9×103千克/米3的铜块，求：（g取l0N/kg ）  （1）该铜块的重力．（2）当该铜块全部浸没水中时，受到的浮力．（3）当该铜块全部浸没在密度为0.8g/cm3的酒精时，弹簧测力计的示数．