题目内容

什么是高风险操作区?

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简述等分的含义及形式。

Since heat will not flow freely from a body at a () temperature to another at a () temperature, it is necessary to expend mechanical work, heat, or electrical energy from an external source to achieve refrigeration.

A. lower;higher
B. shallower;deeper
C. larger;smaller
D. higher;lower

氮氧化物对大气的污染有哪些?

简述杯体虫病(又称为舌杯虫)的病源。

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