判断题

The purpose of man-machine analysis is how to make people work moreeasily. ( )
A、正确
B、错误

答案：错误

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根系吸收的氮素，大部分在根内转化成有机氮化合物，再运往地上部分。
正确
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答案：正确

Directions: Choose the right word or expressions according to the video lecture of this part to describe the features of the five inventions.
2. Oculus Rift is a________________ headset. (virtual reality, real life)

答案： virtual reality