题目内容

气动元件中的油雾器是将润滑油变成雾状并混入压缩空气中,使该压缩空气具有____________作用

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气压系统中的油雾器、空气过滤器、减压阀组成气动三联件,它们联合使用时,其连接顺序应是:______、______、______。

气液阻尼缸是由气缸和________组合而成,可使气缸活塞获得___________的运动速度。

单作用气缸,活塞伸出是气压传动,活塞复位是靠___。

ABC Mining acquired a tract of land containing ore deposits. Total costs of acquisition and development were $1,100,000. ABC estimated the land contained 40,000 tons of ore, and that the land will be sold for $100,000 after the coal is mined.What is ABC’s unit depletion rate?

A. a. $40 per ton
B. $50 per ton
C. $25 per ton
D. $20 per ton

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