判断图中杠杆是否平衡。(已知铁球A的体积是铁球B的体积的2倍)
平衡。铁球A的质量是铁球B的2倍,满足FALA=FBLB。(答案合理即可)
---How did you_____ the old valuable house?
---It used to be_____ my uncle. He left it to me in his will.
A.take possession of; in possession of
B.take the possession of; in the possession of
C.take possession of; in the possession of
D.take the possession of; in possession of
两个定值电阻串联后接在输出电压U稳定于12V的直流电源上,用一个内阻不是远大于的电压表接在两端(如图),电压表示数为8V,如果把此电压表改接在两端,则电压表的系数将
A.等于4V
B.小于4V
C.大于4V小于8V
D.等于或大于8V