Not only                     to determine the depth of the ocean floor, but it is also used to locate oil.

Câu hỏi :

Not only                     to determine the depth of the ocean floor, but it is also used to locate oil.

A seismology is used

B is seismology used

C using seismology

D to use seismology

* Đáp án

B

* Hướng dẫn giải

Phương pháp giải:

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