题目内容

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

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简述杯体虫病(又称为舌杯虫)的病源。

()大都成了老庄思想的传声筒,“理过其辞,淡乎寡味”是其特点。

辅修时不锈钢折角塞门手把丢失时须补装为()球芯折角塞门的手把。

A. 铸铁
B. 铸钢
C. 锻造
D. 不锈钢

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