3、下列哪种情况属于第一种有形磨损( )。（分数：3 分） A. 机器设备由于长期振动，造成部分金属构件疲劳 B. 自然力作用下设备的橡胶件老化 C. 由于摩擦造成设备精 - 查题网

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河南成教 / 工程经济学

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3、下列哪种情况属于第一种有形磨损( )。（分数：3 分）

A. 机器设备由于长期振动，造成部分金属构件疲劳

B. 自然力作用下设备的橡胶件老化

C. 由于摩擦造成设备精度下降

D. 设备金属部件在自然力作用下锈蚀

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工程经济学

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Goats are being hired to do the work of people near San Diego. The fires that occurred in Hillborbough four years ago destroyed thirty homes, most of which have been rebuilt. While people were rebuilding the homes, the grasses and bushes were growing back. The area is now so overgrown in bushes that there is again a major danger of fire.The city government put up bids to remove the bushes. The lowest bid they received was $50,000—and that was if the city provided breakfast and lunch for the workers for the six weeks it would take to clear the overgrown area. The city only wanted to give unlimited coffee and a piece of bread a day for each person. When that offer was rejected, the city asked for help on its website.A sheepherder in Montanta and a goat-keeper in San Bernardino read about the city’s plight（困境）while surfing the Web. They both offered to do the job for $25,000. The city government chose the goat-keeper because he lived closer. When he was told that the city dump（垃圾场）was overflowing , the goat-keeper said, “No problem. My goats will eat everything in your dump, except the car engines, of course.” So, for another $5,000, the city killed two birds with one stone. If all goes well, they will invite the goat-keeper and his “family” back every three years. The goat-keeper said that he would probably visit San Diego while his goats were in the dump. Why was the goat-keeper chosen to remove the bushes? 大学英语（三）

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