化学用语是学好化学知识的重要基础，下列有关化学用语表示正确的是（ ）
①用电子式表示H2、Cl2形成HCl的过程：
，
②MgCl2的电子式：
，
③质量数为133、中子数为78的铯原子：
Cs，
④乙烯的结构简式CH2CH2，
⑤锌锰干电池在放电时正极上的电极反应式为：Zn→Zn2++2e－
| A．①②③④⑤ | B．④⑤ | C．③④ | D．③ |
相关试题
All the dishes in this menu, ______ otherwise stated, will serve two to three people. 
| A．as | B．if | C．though | D．unless |
The children loved their day trip, and they enjoyed the horse ride ______.
| A．most | B．more | C．less | D．little |
Progress______ so far very good and we are sure that the work will be finished on time.
| A．was | B．had been | C．has been | D．will be |
Charles was alone at home, with_______ looking after him.
| A．someone | B．anyone | C．not one | D．no one |
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