Compounds which are plentiful in nature are calcium carbonate, calcium sulphate, and aluminum oxide.

Câu hỏi :

Compounds which are plentiful in nature are calcium carbonate, calcium sulphate, and aluminum oxide.

A abundant                

B obscure                   

C unstable                  

D reliable

* Đáp án

A

* Hướng dẫn giải

Phương pháp giải:

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