问题
选择题
在水溶液中能大量共存的是[ ]
A．Na+、Ca2+、CO32-、NO3-
B．K+、Na+、OH-、CO32-
C．Ba2+、K+、HCO3-、OH-
D．H+、Ba2+、ClO-、NO3-
答案
答案：B
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在水溶液中能大量共存的是[ ]
A．Na+、Ca2+、CO32-、NO3-
B．K+、Na+、OH-、CO32-
C．Ba2+、K+、HCO3-、OH-
D．H+、Ba2+、ClO-、NO3-
答案：B
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| Most people were asleep at night, but Frank was 1 . Frank was a night watchman. His work was to guard a large factory. He had to keep everything 2 . He felt lonely because there was 3 there to talk with. Frank liked his work. If he heard a noise, he went 4 to see what it was. Most of time he walked around inside the big building but he also walked around outside 5 . When he was 6 , he could sit on a chair by the door. In the winter it was very cold. He 7 a warm coat when he left the factory. Last night when Frank went outside, he heard a noise near the gate of the factory. He went very quietly to the noise to see 8 somebody was there, but he saw only a small dog. It looked cold and sad. He took the dog inside the factory and the happy dog 9 him around. The dog was a good friend for the night watchman. Frank was no longer 10 . He could talk to the dog. | ||||
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