中学生网络课堂本课配套习题挑战模式1/5
单选题
难度系数：
1.
体积相同的两块金属由密度为ρ1和ρ2两种物质组成，它们混合组成的金属块密度为ρ，则ρ等于（ ）
| A: （ρ1+ρ2）/2 |
| B: ρ1ρ2/（ρ1+ρ2） |
| C: （ρ1+ρ2）/2ρ1ρ2 |
| D: ρ1ρ2/2（ρ1+ρ2） |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+6K6+5Lik56eN54mp6LSo5L2T56ev6YO95pivVjwvcD4=
- 提示2：PHA+55SoVuWSjM+BPHN1Yj4xPC9zdWI+LM+BPHN1Yj4yPC9zdWI+6KGo56S65Ye65oC76LSo6YePPC9wPg==
- 提示3：PHA+55SoVuihqOekuuWHuuaAu+S9k+enrzwvcD4=
- 答案：QQ==
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
本课配套习题挑战模式2/5
单选题
难度系数：
2.
密度为ρ1的液体和密度为ρ2的液体质量相等，将它们均匀混合在一起，设混合后的总体积等于它们各自的体积之和，混合液的密度是（ ）
| A: (ρ1+ρ2) /2 |
| B: 2(ρ1+ρ2) /ρ1•ρ2 |
| C: ρ1•ρ2 |
| D: 2ρ1ρ2 /(ρ1+ρ2 ) |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+6K6+5q+P56eN54mp6LSo6LSo6YeP6YO95pivbTxicj48L3A+
- 提示2：PHA+5YiZ5oC76LSo6YeP5pivMm08YnI+PC9wPg==
- 提示3：PHA+55SobTxzdWI+PC9zdWI+5ZKMz4E8c3ViPjE8L3N1Yj7vvIxt5ZKMz4E8c3ViPjI8L3N1Yj7ooajnpLrmgLvkvZPnp688YnI+PC9wPg==
- 答案：RA==
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
本课配套习题挑战模式3/5
单选题
难度系数：
3.
有一块体积为V、质量为M的合金，它是由两种金属A和B合成的，且混合后总体积不变，已知合成前密度为ρ1金属A的体积为V1，则金属B密度ρ2为（ ）
| A: ρ1V1/( V−V1) |
| B: M−ρ1V1/V |
| C: ( M−ρ1V1)/( V−V1) |
| D: M−ρ1V1/V1 |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+5oOz5rGCz4E8c3ViPjI8L3N1Yj7lv4Xpobvnn6XpgZPPgTxzdWI+Mjwvc3ViPueahOi0qOmHj+WSjOS9k+enrzwvcD4=
- 提示2：PHA+QueahOi0qOmHj+WPr+S7peeUqOaAu+i0qOmHj03lkozPgTxzdWI+MTwvc3ViPjxzdWI+77yMPC9zdWI+VjxzdWI+MTwvc3ViPuaxguWHuuadpeOAgjwvcD4=
- 提示3：PHA+QueahOS9k+enr+WPr+S7peeUqOaAu+S9k+enr1blkoxWPHN1Yj4xPC9zdWI+5rGC5Ye65p2l44CCPGJyPjwvcD48cD48YnI+PC9wPg==
- 答案：Qw==
PGRpdj7ph5HlsZ5C55qE5L2T56ev77yaVjxzdWI+Qjwvc3ViPj1WLVY8c3ViPkE8L3N1Yj49Vi1WPHN1Yj4xPC9zdWI+77yM6YeR5bGeQueahOi0qOmHj208c3ViPkI8L3N1Yj49TS1tPHN1Yj5BPC9zdWI+PU0tz4E8c3ViPjE8L3N1Yj5WPHN1Yj4xPC9zdWI+77yM5omA5Lul6YeR5bGeQuWvhuW6ps+BPHN1Yj4yPC9zdWI+PW08c3ViPkI8L3N1Yj4gL1Y8c3ViPkIgPC9zdWI+PShN4oiSz4E8c3ViPjE8L3N1Yj5WPHN1Yj4xPC9zdWI+KS8oVuKIklYxIC4g5pWF562U5qGI5Li677yaKCBN4oiSz4E8c3ViPjE8L3N1Yj5WPHN1Yj4xPC9zdWI+KS8oVuKIklY8c3ViPjE8L3N1Yj4pPC9kaXY+
本课配套习题挑战模式4/5
单选题
难度系数：
4.
将密度为0.9g/cm3甲液体50ml和与密度为1.2g/cm3的乙液体40ml混合，混合后的总体积为原来的90%，求混合液的密度（ ）
| A: 1.2g/cm3 |
| B: 1.15g/cm3 |
| C: 1.0g/cm3 |
| D: 0.3cm3 |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+5re35ZCI5ray5a+G5bqm562J5LqO5re35ZCI5ray6LSo6YeP6Zmk5Lul5re35ZCI5ray5L2T56ev44CCPGJyPjwvcD4=
- 提示2：PHA+5re35ZCI5ray6LSo6YeP562J5LqO5Lik54mp6LSo6LSo6YeP5LmL5ZKM44CCPGJyPjwvcD4=
- 提示3：PHA+5re35ZCI5ray5L2T56ev562J5LqO5Lik5L2T56ev5LmL5ZKM5LmY5LulOTAl44CCPGJyPjwvcD4=
- 答案：Qg==
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
本课配套习题挑战模式5/5
单选题
难度系数：
5.
甲物质的密度为2g/cm3，乙物质的密度为5g/cm3，各取一定质量的甲、乙混合后的密度为3g/cm3. 假设混合前后总体积保持不变，则所取甲、乙两种物质的质量之比为（ ）
| A:
2：5 |
| B:
5：2 |
| C:
4：5 |
| D:
5：4 |
一次做对，真牛！
+5奖励规则>
- 提示1：CiAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICA8cD7orr7otKjph4/liIbliKvmmK9tPHN1Yj7nlLI8L3N1Yj7jgIFtPHN1Yj7kuZk8L3N1Yj48L3A+CiAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICA=
- 提示2：CiAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICA8cD7moLnmja7lr4bluqblhazlvI/vvIzlj6/ku6XooajnpLrlh7pWPHN1Yj7nlLI8L3N1Yj7lkoxWPHN1Yj7kuZk8L3N1Yj48L3A+CiAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICA=
- 提示3：CiAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICA8cD7mt7flkIjlkI7nmoTlr4bluqYzZy9jbTxzdXA+Mzwvc3VwPj3vvIhtPHN1Yj7nlLI8L3N1Yj4rbTxzdWI+5LmZPC9zdWI+77yJL++8iFY8c3ViPueUsjwvc3ViPitWPHN1Yj7kuZk8L3N1Yj7vvIk8L3A+CiAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICA=
- 答案：Qw==
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
