A:④⑤③
B:⑥①⑤③
C:⑥①⑤②
D:⑧②⑤③
Mrs White came to our school in 1996 . She _________ here for nearly 20 years
重4N的物体挂在弹簧测力计上,当物体浸没水中静止时,其示数为2.5N,则物体受到的浮力是( )