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反应动力学主要研究化学反应进行的机理和速率。

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Students with health anxiety may become ___________ that a headache or stomach ache means they have cancer.

2FSK信号相当于两路2ASK信号的和。

2. We b______ cake or bread in an oven at a quite high temperature.

奴赛尔准数Nu是反映流体的物性对对流传热的影响。（）