问题
选择题
分别用20mL1mol/L BaCl2溶液恰好可使相同体积的硫酸铁、硫酸锌和硫酸钾三种溶液中的硫酸根离子完全转化为硫酸钡沉淀，则三种硫酸盐溶液的物质的量浓度之比是 [ ]
A．3∶2∶2
B．1∶2∶3
C．1∶3∶3
D．3∶1∶1
答案
答案：C
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分别用20mL1mol/L BaCl2溶液恰好可使相同体积的硫酸铁、硫酸锌和硫酸钾三种溶液中的硫酸根离子完全转化为硫酸钡沉淀，则三种硫酸盐溶液的物质的量浓度之比是 [ ]
A．3∶2∶2
B．1∶2∶3
C．1∶3∶3
D．3∶1∶1
答案：C
| 用方框中所给短语的适当形式填空。 | |
2. David is leaving for Wenzhou _____. 3. _____, he has to travel to a country where English is not spoken. 4. Long long ago, many British people _____ to leave their country and brought the English language to other countries. 5. If you want to _____ studying English well, you need to do more listening and reading. |