本课配套习题挑战模式2/5
单选题
难度系数:
2.将硬水中某些可溶性钙、镁化合物除去时,可以降低水的硬度.为达到此目的,某小组同学设计了下列四种方法,你认为其中可行的是
A: 静置 |
B: 过滤 |
C: 蒸馏 |
D: 加入稀盐酸 |
一次做对,真牛!
+5奖励规则>
- 提示1:5b+F6aG75bCG6ZKZ56a75a2Q44CB6ZWB56a75a2Q6Zmk5Y676Z2Z572u6L+H5ruk5LiN6IO96L6+5Yiw5pWI5p6c44CC
- 答案:Qw==
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本课配套习题挑战模式3/5
单选题
难度系数:
3.下列有关硬水的叙述,不正确的是
A: 硬水中含有较多可溶性钙、镁化合物 |
B: 硬水中不含或含较少可溶性钙、镁化合物 |
C: 硬水易生水垢,与肥皂作用不易起泡沫 |
D: 硬水可以软化为软水 |
一次做对,真牛!
+5奖励规则>
- 提示1:56Gs5rC05piv5oyH5ZCr5pyJ6L6D5aSa6ZKZ44CB6ZWB56a75a2Q55qE5rC0
- 提示2:5bi455So6IKl55qC5rC05p2l5Yab5Yy65YiG56Gs5rC05ZKM6L2v5rC044CC
- 提示3:5Y+v5Lul6YeH5Y+W5LiA5Lqb5o6q5pa95L2/5b6X5rC055qE56Gs5bqm6ZmN5L2O44CC
- 答案:Qg==
QeOAgeehrOawtOaYr+aMh+WQq+aciei+g+WkmumSmeOAgemVgeemu+WtkOeahOawtO+8jOato+ehru+8mzxicj5C44CB56Gs5rC05piv5oyH5ZCr5pyJ6L6D5aSa6ZKZ44CB6ZWB56a75a2Q55qE5rC077yM5LiN5ZCr5oiW5ZCr6L6D5bCR5piv6ZSZ6K+v55qE77ybPGJyPkPjgIHljLrliIbnoazmsLTlkozova/msLTnmoTmlrnms5XmmK/vvJrnlKjogqXnmoLmsLTvvIzliqDlhaXogqXnmoLmsLTvvIzms6HmsqvlpJrnmoTmmK/ova/msLTvvIzms6HmsqvlsJHnmoTmmK/noazmsLTvvIzmraPnoa7vvJs8YnI+ROOAgemZjeS9juawtOeahOehrOW6pueahOaWueazleaYr++8muWKoOeDreeFruayuOOAgeiSuOmmj++8jOato+ehru+8mzxicj7mlYXpgIlC
本课配套习题挑战模式4/5
单选题
难度系数:
4.通过下列操作可以使硬水软化的是
A: 蒸馏 |
B: 活性炭吸附 |
C: 加入肥皂水 |
D: 过滤 |
一次做对,真牛!
+5奖励规则>
- 提示1:5rOo5oSP5Yy65YiG4oCc6Ym05Yir4oCd5LiO4oCc56Gs5rC06L2v5YyW4oCd44CC
- 答案:QQ==
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
本课配套习题挑战模式5/5
单选题
难度系数:
5.下列生活经验中,正确的是
A: 用硬水洗涤衣服,既能节省肥皂,也能洗净衣服 |
B: 为了节约用水,农业和园林的浇灌改为喷灌和滴灌 |
C: 长期饮用市面上的纯净水对人体有益无害 |
D: 锅炉用水不管软水、硬水都可以 |
一次做对,真牛!
+5奖励规则>
- 提示1:5L2/55So56Gs5rC05rSX5rak6KGj5pyN5Lya5rWq6LS56IKl55qC44CC
- 提示2:5biC6Z2i5LiK55qE57qv5YeA5rC057y65bCR5b6u6YeP5YWD57Sg44CC
- 提示3:6ZSF54KJ55So56Gs5rC05Lya57uT5rC05Z6i
- 答案:Qg==
5Zug5Li656Gs5rC05Lit5ZCr5pyJ6L6D5aSa55qE5Y+v5rq25oCn6ZKZ6ZWB5YyW5ZCI54mp77yM55So5a6D5rSX5rak6KGj5pyN77yM5pei5rWq6LS56IKl55qC77yM5Lmf5rSX5LiN5YeA6KGj5pyN77yOPGJyPumVv+acn+mlrueUqOW4gumdouS4iueahOe6r+WHgOawtOS8muS9v+S6uue8uuWwkeW+rumHj+WFg+e0oO+8jOWvueS6uuS9k+acieWus++8jjxicj7plIXngonnlKjnoazmsLTkvJrnu5PmsLTlnqLvvIzml7bpl7Tplb/kuobvvIzkvJrmtarotLnnh4PmlpnvvIznlJroh7PlvJXotbfniIbngrjnjrDosaHvvIzlupTor6XnlKjova/msLTvvI48YnI+5pWF6YCJQg==