– Can a plane fly _______ the Atlantic Ocean?–Yes, but it needs to go _______ the clouds for hours.
A:across, through
B:through, across
C:across, across
D:through, through
实验次数
液体的密度ρ/(g•cm﹣3)
排开液体的体积v/cm3
物体的重力G/N
弹簧测力计的示数F/N
浮力Fa/N
1
0.8
50
0.70
0.30
0.40
2
1.0
0.20
0.50
3
1.2
0.10
0.60
4
60
0.84
0.24
5
70
0.98
①
某同学看到化学方程式:2Cu+O22CuO,就联想到一点:铜和氧气在加热的条件下反应生成了氧化铜.你能想到更多吗?把你的想法补充到下面:
(1)____ ;
(2)____ .