问题
选择题
体积相同的NaCl、MgCl2、AlCl3溶液，沉淀其中的Cl－，消耗等量的AgNO3，三种溶液的物质的量浓度之比为 ( )
A．3∶2∶1
B．1∶2∶3
C．6∶3∶2
D．2∶3∶6
答案
答案：C
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体积相同的NaCl、MgCl2、AlCl3溶液，沉淀其中的Cl－，消耗等量的AgNO3，三种溶液的物质的量浓度之比为 ( )
A．3∶2∶1
B．1∶2∶3
C．6∶3∶2
D．2∶3∶6
答案：C
| 完形填空。 | ||||
| Jimmy started painting when he was four years old. When he was six, he was already very good at it. He 1 many beautiful and interesting pictures, and people 2 a lot of money for them. They said, "This boy's going to be 3 when he's a little older, and then we're going to 4 these pictures for a lot more money. Then we will get rich." Jimmy's pictures were 5 from other people's because he never painted on the whole piece of 6 . He painted on half of it, and the other half was always 7 . "That's very clever," everyone said," 8 else does that!" One day somebody bought one of Jimmy's 9 and then said to him, "Please tell me this, Jimmy. Why do you paint on the 10 half of your paper, but not on the top half?" "Because I'm small," Jimmy said, "and my brushes don't reach very high." | ||||
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