问题
选择题
There is a bridge _____________ there. [ ]
A. in
B. at
C. over
答案
答案:C
There is a bridge _____________ there. [ ]
A. in
B. at
C. over
答案:C
下表中数据为一个空瓶的质量、容积等各项参数.在瓶中装满水后,将它放在水平地面上,如图所示.求:
质量m瓶(千克) | 1×10-1 |
底面积S瓶(米2) | 3.5×10-3 |
瓶盖面积S盖(米2) | 7×10-4 |
高h瓶(米) | 2×10-1 |
容积V瓶(米3) | 6×10-4 |
(2)若旋紧瓶盖后把瓶子倒置,如图所示,求瓶子对桌面的压强p瓶.