单项选择题

1.生物多样性是指生物的多样化和变异性以及物种生境的生态复杂性。

A．对
B．错

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单项选择题

(Single choice question) What is the purpose of unsupervised learning? ()
A、Explore the relationship between input features and output tags.
B、Establish the input representation that can be used for decision-making, predict the future input, and effectively transfer the input to another machine.
C、Explore data structures with classroom / output guidance.
D、Modeling of known models based on historical data.

北半球白天最短是哪一天？

答案： 1.冬至
2.立冬
正确答案：冬至
冬至标示着北半球的太阳高度最小，白昼时间最短，但是冬至日的温...