判断题

固相微萃取法（SPME）的萃取头对样品挥发物的萃取效果都一样。

答案：错误

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不定项选择

利他行为必然会让利他者付出代价。（）‌

A．正确
B．错误

单项选择题

Which of the following needs is not in the five-type hierarchy of human needs

A、safe needs
B、social needs
C、esteem needs
D、emotional needs