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简述汉代训诂的成就。

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单位物质（）单纯由于（）所吸收或放出的热量称为潜热

什么是物流信息？物流信息与其他信息相比有什么特点？

Ethanol is commonly used as a gasoline supplement, but it is currently about（）methanol.

A. twice as expensive as
B. twice as more expensive as
C. as twice more expensive as
D. as twice expensive a

装置停车时，应制定催化剂保护方案，用（）对反应器进出口消除温差。

A. 氮气
B. 真空
C. 循环原料
D. 空气