本课配套习题挑战模式1/5
单选题
难度系数:
1.一支粉笔,被用去一段以后,剩下的粉笔()
A: 质量减小,密度减小 |
B: 质量减小,密度不变 |
C: 体积减小,密度增大 |
D: 体积减小,密度减小 |
一次做对,真牛!
+5奖励规则>
- 提示1:5LiA5pSv57KJ56yU77yM6KKr55So5Y675LiA5q615Lul5ZCO77yM5omA5ZCr54mp6LSo5YeP5bCP77yM5omA5Lul6LSo6YeP5Y+Y5bCP
- 提示2:5a+G5bqm5piv54mp6LSo55qE5bGe5oCn77yM5omA5Lul5a+G5bqm5LiN5Y+Y
- 答案:Qg==
5LiA5pSv57KJ56yU77yM6KKr55So5Y675LiA5q615Lul5ZCO77yM5omA5ZCr54mp6LSo5YeP5bCP77yM5omA5Lul6LSo6YeP5Y+Y5bCP77ybPGJyPuWvhuW6puaYr+eJqei0qOeahOWxnuaAp++8jOaJgOS7peWvhuW6puS4jeWPmO+8jOWNs+i0qOmHj+WHj+Wwj++8jOS9k+enr+S5n+WHj+Wwj++8jOi0qOmHj+S4juS9k+enr+avlOS4jeWPmOOAgjxicj7mlYXpgIlC44CC
本课配套习题挑战模式2/5
单选题
难度系数:
2.在生产生活中,下列情况主要从密度的角度考虑的是( )
A: 用塑料做炒锅的手柄 |
B: 用塑料泡沫表演场景中倒塌的“墙壁” |
C: 用水给发动机冷却 |
D: 用铜丝做导线 |
一次做对,真牛!
+5奖励规则>
- 提示1:55So5aGR5paZ5YGa54KS6ZSF55qE5omL5p+E5piv5Li65LqG6Ziy5q2i54KS6ZSF5L2/55So5pe254Or5omL77yM5Yip55So5LqG5aGR5paZ55qE5a+854Ot5oCn5beu
- 提示2:6ZOc5YW35pyJ6Imv5aW955qE5a+855S15oCn
- 答案:Qg==
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
本课配套习题挑战模式4/5
单选题
难度系数:
4.甲、乙两个实心球,体积之比5:3,质量之比5:2,甲、乙两球的密度之比是()
A: 5:3 |
B: 25:6 |
C: 2:3 |
D: 3:2 |
一次做对,真牛!
+5奖励规则>
- 提示1:PGltZyB3aWR0aD01MSBoZWlnaHQ9MjEgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC8zRS9FNi9yQkFDSjFUSWxseVFRSlJRQUFBQnNrb0FxdXc2NjUucG5nIj4=
- 答案:RA==
55Sx6aKY5oSP5Y+v55+l77yMVjxzdWI+55SyPC9zdWI+77yaVjxzdWI+5LmZPC9zdWI+PTXvvJoz77yMbTxzdWI+55SyPC9zdWI+77yabTxzdWI+5LmZPC9zdWI+PTXvvJoy77yMPGJyPuaJgOS7peS4pOeQg+eahOWvhuW6puS5i+avlOS4us+BPHN1Yj7nlLI8L3N1Yj7vvJrPgTxzdWI+5LmZPC9zdWI+PTM6Mu+8juaVhemAiUTvvI4=
本课配套习题挑战模式5/5
单选题
难度系数:
5.我们通常所说的“铁比木头重”,实际是指( )
A: 铁的质量比木头的密度大 |
B: 铁的体积比木头的体积大 |
C: 铁的密度比木头的密度大 |
D: 铁的硬度比木头的硬度大 |
一次做对,真牛!
+5奖励规则>
- 提示1:5Zyo55u45ZCM5L2T56ev5LiL77yM6ZOB55qE6LSo6YeP5q+U5pyo5aS055qE6LSo6YeP5aSn
- 答案:Qw==
5Zyo55u45ZCM5L2T56ev5LiL77yM6ZOB55qE6LSo6YeP5q+U5pyo5aS055qE6LSo6YeP5aSn77yM5omA5Lul5oyH6ZOB55qE5a+G5bqm5q+U5pyo5aS055qE5a+G5bqm5aSn77yMQ+ato+ehruOAgg==