问题
选择题
与OH-具有相同质子数和电子数的微粒
A．F-
B．NH3
C．H2O
D．Na+
答案
答案：A
OH-的质子数和电子数分别是9和10。选项A～D中的质子数和电子数分别为9和10、10和10、10和10、11和10.所以答案选A。
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与OH-具有相同质子数和电子数的微粒
A．F-
B．NH3
C．H2O
D．Na+
答案：A
OH-的质子数和电子数分别是9和10。选项A～D中的质子数和电子数分别为9和10、10和10、10和10、11和10.所以答案选A。
| 阅读理解 |
Tom is a young man.He has a very big dog and he has a very small car,too.He likes playing tennis.Today he plays tennis for two hours at the club and then he wants to go home by car.His dog comes after him,but it does not jump(跳) into the same car.It jumps into the next(下一个)car. "come here, foolish dog!"Tom shouts(喊) at it ,but the dog still stays in the next car.Tom put his key into the lock(锁) of the car, but the key does not turn(转动).Then he looks at the car again.It is not his car! He is in the wrong car!And the dog is in the right car! |
| True of false(判断正T，误F) |
| ( )1.Tom has a big car. |
| ( )2.Today Tom plays tennis for two hours. |
| ( )3.Tom wants to go home by car. |
| ( )4.When Tom puts his key into the lock of the car,the key doesn't turn. |
| ( )5.In fact(事实上),Tom is in the right car. |