问题
选择题
电子构型为[Ar]3d54s2的元素是[ ]
A．稀有气体
B．过渡元素
C．主族元素
D．卤族元素
答案
B
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电子构型为[Ar]3d54s2的元素是[ ]
A．稀有气体
B．过渡元素
C．主族元素
D．卤族元素
B
| 选词填空。 | |
It's in the ______． 2. They ______, ______ then. Now they ______ old. 3. Sanya is in the ______ of China. 4. She ______ very clever. 5. It's a book ______ England. 6. There are many boats ______ the river. 7. People speak English ______ America. |