Which of the following could be of NO value to increase crop yields?

Câu hỏi :

Which of the following could be of NO value to increase crop yields?

A The use of a GPS receiver   

B Testing soil samples

C Fixing a sensor to alarm machinery

D The excessive use of chemicals

* Đáp án

C

* Hướng dẫn giải

Phương pháp giải:

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