轮胎充气时,压气中不能()。

题型:填空题

问题:

轮胎充气时,压气中不能()。

考点:凿岩爆破工考试凿岩爆破工(综合练习)凿岩爆破工(综合练习)题库
题型:填空题

阅读理解。

     For the people living in the Nile Basin, the river is their life. This 6 825 km waterway, whose watershed

(流域) covers three million square kilometers, flows through mountains, woodlands, lakes and deserts. Its

potential for fishing, tourism and shipping is great-but so are its challenges.

     Water shortage already serious in Egypt and Sudan, will soon influence several other countries in the

watershed as well. Today, about 160 million people depend on the Nile River for their living. Within the next

25 years, the district's population is expected to double, adding to the demand brought about by growth in

industry and agriculture. The frequent drought (干旱) adds to the urgency.

     Water quality is also a problem Precious soil is washed out to sea. Wastes from industry and agriculture

create pollution. Higher concentrations of salt influence irrigated soils. Water-borne diseases continue

unchecked. In areas where it's hot and damp, water hyacinths choke off lakes, dams and other sections of

the river, making it difficult for fishing and other businesses to move forward.

     Native people along the narrow area of farmland have watched the sand move closer day by day. They've

seen the river change course, and their only source (来源) of water thickened with mud. They're very poor

and have few choices.

     But a new program, the Nile Basin Initiative (NBI), is offering very practical assistance. The program is

more than just a water-management project. It's a plan for the social and economic development of a vast

district: it concentrates on the needs of the poorest of the poor and the environment that supports them.

     These are whole ecosystem problems, calling for united solutions (解决办法). Half the Nile Basin's

countries are among the world's poorest nations; yet, somehow, they must find the resources, skills and

political will to overcome these challenges.

1. What are the great challenges the Nile Basin faces? [ ]

A. The development of shipping industry.

B. Overfishing of native people.

C. Water shortage and water quality.

D. Increasing population and tourism.

2. The underlined word "hyacinths" (in Paragraph 3) refers to "_____". [ ]

A. animals

B. plants

C. rocks

D. salts

3. The program NBI is mainly aimed at _____. [ ]

A. preventing water pollution

B. changing the river course

C. improving living conditions of the poor

D. preventing land from becoming desert

4. What would be the best title of this passage? [ ]

A. People's Life in Egypt and Sudan

B. Frequent Drought in Egypt and Sudan

C. The Poorest Countries in the Nile Basin

D. The Ecosystem Problems in the Nile Basin

题型:填空题

有两种溶液,pH分别为3和5,这两种溶液的[H+]之比是

A.3∶5

B.5∶3

C.100∶1

D.1∶100

题型:填空题

过滤器滤芯堵塞时,会引起过滤器的()减小。

A.温度

B.通过量

C.压差

D.通过能力

题型:填空题

戦後最大の不況下()、尐しでも無駄をはぶくことが要求されている。

A.ながらも

B.たりとも

C.にあって

D.であれ

题型:填空题

男性,35岁,2周前感冒、发热、咳嗽,1周前自愈。近日感胸闷、气短、间断呕吐。体检:心尖区第一心音减弱,Ⅱ~Ⅲ/6级收缩期吹风样杂音,心律整齐,心率100次/分。胸部后前位片正常。血常规白细胞10×109/L,中性粒细胞0.65。血沉25mm/h。CK-MB和cTnT增高。心电图提示T波普遍低平。

为明确诊断,应常规做下列哪项检查

A.心脏超声检查

B.心肌、心内膜或心包活组织检查

C.血清CVB中和抗体滴度测定

D.心包穿刺

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