To the naked eye, this silk appears to be smooth, but under the microscope, cultivated silk fiber looks coarse.

Câu hỏi :

To the naked eye, this silk appears to be smooth, but under the microscope, cultivated silk fiber looks coarse.

A strong

B rough

C stiff

D refined

* Đáp án

B

* Hướng dẫn giải

Phương pháp giải:

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