能影响金属毒物吸收和毒性的是()。 A.维生素C B.维生素D C.糖类

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问题:

能影响金属毒物吸收和毒性的是()。

A.维生素C

B.维生素D

C.糖类

D.蛋白质

E.水

考点:营养与食品卫生(医学高级)营养与食品卫生综合练习营养与食品卫生综合练习题库
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In the early hours of March 8, a Boeing 777 took off from Kuala Lumpur, Malaysia. Its destination was Beijing. But for unknown reasons, it never arrived there.

There were 239 people on the Malaysia Airlines flight, including 154 Chinese. As of March 13, 12 different countries, including Malaysia, China, Vietnam and the US, were searching for the plane.

The disappearance is an “aviation (航空) mystery”, Azharuddin Abdul Rahman, the head of Malaysia’s Civil Aviation Authority, said on March 10.There was no clear sign of a crash by March 13.

Between 1-2 hours after takeoff, the plane suddenly lost contact with people on the ground. The weather was clear, and the pilots didn’t make any calls . No evidence was found in the area where the flight last made contact. People are also talking about a possible hijacking (劫机).

International police agency Interpol confirmed on March 9 that at least two passengers on the flight had used stolen passports to get on board. “We are looking at all possibilities,” said Malaysian Transport Minister Hishamuddin Hussein. The incident is now being called simply a “plane disappearance”.

So, what are some possible causes of a plane disappearance? An AP story provided a summary.

1. A failure of the plane’s body or its engines. However, even if both engines stopped working, the plane could still glide (滑翔) for up to 20 minutes, giving pilots time to make an emergency call.

2. Bad weather. Planes are designed to fly through most severe storms. However, in June 2009, an Air France flight from Rio de Janeiro to Paris crashed during a bad storm over the Atlantic Ocean.

3. A bomb. Throughout history, several planes have been brought down by bombs.

4. An accidental shoot-down by some country’s military. In July 1988, the US Navy accidentally shot down an Iran Air flight. In September 1983, a Korean Air Lines flight was shot down by a Russian fighter jet.

No matter how unlikely a situation, it’s too early to determine what really happened to MH370. It could take months, if not years, to rule out any possibilities, say experts..

小题1:How many cities are mentioned in this passage?

A.Four cities.

B.five cities.

C.Six cities.

D.Seven cities.小题2:What could the underlined phrase “rule out” in the last paragraph mean?

A.cross out

B.get rid of

C.take out

D.take the place of小题3:What could be the best title of the passage?

A.An Air Crash

B.The Causes of the Disappearance

C.The Disappearance of MH 370

D.An Aviation Mystery

题型:多项选择题

关于彩色多普勒血流成像,下列正确的是()

A.对平均速度为零的灌注区血流能显示

B.血流成像对超声入射角度的相对非依赖性

C.不会出现彩色血流信号混迭现象

D.不能显示血流速度快慢

E.能显示血流方向

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蒸馏法制备注射用水时,蒸馏水器附带有隔膜装置。

热原有耐热性,在高温除去热原的方法中可以1分钟除去热原的温度为()

A.500℃

B.550℃

C.600℃

D.650℃

E.700℃

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育苗场如何判别所购买的卤虫卵的质量好坏?

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《国家“十一五”时期文化发展纲要》指出,要广泛开展文明城市、文明村镇、文明行业创建活动,使城乡环境面貌有较大改观、社会服务水平有显著改善、公民文明素质和社会现代文明程度有明显提高。材料表明()

A.国家要积极发展文化产业

B.国家要积极发展教育事业

C.国家要积极发展文艺体育事业

D.国家积极推进社会主义精神文明创建活动

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