A:8个中子的碳原子的核素符号:12C
B:HF的电子式:
C:Cl﹣离子的结构示意图:
D:CO2的结构式:O=C=O
Lily isn't as ________ as Peter. She often makes mistakes in her composition.
代读“地球赤道面与公转轨道面示意图”,完成下题.