以冷却孔把冷却空气汇聚、提高流速喷射冲击金属内面来实现冷却方式为()。A、冲击冷却B

题型:单项选择题

问题:

以冷却孔把冷却空气汇聚、提高流速喷射冲击金属内面来实现冷却方式为()。

A、冲击冷却

B、薄膜冷却

C、対流冷却

考点:燃气轮机机电运行工燃气轮机机电运行工(初级)燃气轮机机电运行工(初级)题库
题型:单项选择题

下列关于非洲气候及其特征的叙述,正确的是[ ]

A.非洲西北和西南角属于亚热带季风气候

B.热带沙漠气候分布最广

C.马达加斯加岛西岸属于热带雨林气候

D.以赤道为轴,气候带南北呈对称分布

题型:单项选择题

张女士,32岁,因畏寒、发热、厌油、恶心呕吐、食欲不振、乏力就诊,诊断为甲型肝炎,收入院治疗。

以下哪项不是甲肝的治疗原则()。

A.支持治疗

B.对症治疗

C.抗纤维化治疗

D.激素治疗

E.抗HCV治疗

题型:单项选择题

去年,湛江市寸金公园内的湖面上漂浮着大量死鱼.小亮闻讯后.取回水样和同学们一起探究.

(1)通过观察,发现该湖水浑浊,水质发臭变黑,请你分析造成水质恶化的原因(至少答两点): _________

(2)观察水质的能见度,然后过滤.过滤时无须用到以下仪器中的. _________ (用序号表示).

A.漏斗

B.烧杯

C.玻璃棒

D.铁架台

E.酒精灯

(3)过滤后的水澄清透明,它是 _________

A.纯净物

B.混合物

C.软水

D.可以饮用的水

(4)面对湖水严重污染,有人建议:①对排入湖内的污水预先进行治理;②将水库的水引入,把湖中的污水及污泥冲走,使死水变活;③使用成本低、效果好、不产生二次污染的生物酶技术治理湖水.以上建议你不同意的是 _________ (填序号),理由是 _________

题型:单项选择题

上斜肌能使眼球前极转向:

A.上内方

B.下内方

C.上外方

D.下外方

E.上方

题型:单项选择题

George Williams, one of Scottsdale’s last remaining cowboys, has been raising horses and cattle on his 120 acres for 20 years. The cattle go to the slaughterhouse, the horses to rodeos. But Mr. Williams is stomping mad. His problems began last year when dishonest neighbours started to steal his cattle. Then other neighbours, most of them newcomers, took offence at his horses roaming on their properties.

Such grumbles are common in Arizona. The most recent Department of Agriculture census shows that 1 213 of Arizona’s 8 507 farms closed down between 1997 and 2002. Many cattlemen are moving out to remoter parts of the state.

Doc Lane is an executive at the Arizona Cattlemen’s Association, a trade group. He says Arizona’s larger ranch owners are making decent profits from selling. It is the smaller players who are the victims of rising land values, higher mortgages and stiffer city council rules. What happens all too often is that people move in next to a farm because they think the land pretty. But soon they start complaining to the council. In Mr. Williams’s case it was the horses that annoyed them. Other newcomers don’t like the noise, the pesticides and the smell of manure.

Locals worry about the precious, dwindling cowboy culture. Arizona’s tourism boards like to promote a steady interest in all things about cowboy and western. Last year more British and German tourists came than usual, and many of them were looking precisely for that. Arizona’s Dude Ranch Association fills its $ 350-a-night luxury ranches most of the year; roughly a third of the guests are European.

Many of the ranchers themselves see all this tourism as a cheeky attempt to commercialise a real and vanishing culture. In Prescott, estate agents promote "American Ranch-style" homes with posters of horse riders. On the other side of the street is Whiskey Row, a famous strip of historic cowboy bars. But in Matt’s Saloon on Saturday night, real cattlemen could not be found.

Farm folk like Mr. Knox and Mr. Williams are weighing up their options. Many will migrate to remoter places where land is cheaper and not crowded with city people. Younger ones take on side-jobs as contractors and are cattle-hands part-time. Older cowboys aren’t sure what to do.

The word "grumble" (Line 1 , Paragraph 2) most probably means ()

A. mutter

B. phenomenon

C. complaint

D. gamble

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