题型:判断题 --- What has made him upset recently?--- __________ alone to face a troublesome case.A.LeftB.Being leftC.Having leftD.To leave 查看答案
题型:判断题 一金属块在空气中受到的重力为25N,把它挂在弹簧测力计的挂钩上,并且全部浸没在水中称时(金属块未接触水底),弹簧测力计的示数为20N.求:(1)金属块受到水对它的浮力的大小;(2)该金属块的体积. 查看答案