对于吸附的强弱描述错误的是() A.吸附现象与两相界面张力的降低成反比B某物质自溶液

题型:单项选择题

问题:

对于吸附的强弱描述错误的是()

A.吸附现象与两相界面张力的降低成反比

B某物质自溶液中被吸附程度与其在溶液中的溶解度成正比

C.极性吸附剂容易吸附极性物质

D.非极性吸附剂容易吸附非极性物质

考点:生物分离工程生物分离工程题库
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填质数:36=(    )+(    )=(    )+(    )=(    )+(    )=(    )+(    )

题型:单项选择题

某城市一座人行天桥,跨越等道车行道,根据《城市人行天桥与人行地道技术规范》(CJJ69-95),对人行天桥上部结构竖向自振频率(Hz)严格控制。试问,这个控制值的最小值应为下列何项数值()?

A.2.0

B.2.5

C.3.0

D.3.5

题型:单项选择题

阅读理解。

     It was a winter morning, just a couple of weeks before Christmas 2005. While most people were

warming up their cars, Trevor, my husband, had to get up early to ride his bike four kilometers away

from home to work. On arrival, he parked his bike outside the back door as he usually does. After

putting in 10 hours of labor, he returned to find his bike gone.

     The bike, a black Kona 18 speed, was our only transport. Trevor used it to get to work, putting in

60-hour a week to support his young family. And the bike was also used to get groceries, saving us from

having to walk long distances from where we live.

     I was so sad that someone would steal our bike that I wrote to the newspaper and told them our

story. Shortly after that, several people in our area offered to help. One wonderful stranger even bought

a bike, then called my husband to pick it up. Once again my husband had a way to get to and from his

job. It really is an honor that a complete stranger would go out of their way for someone they have never

met before.

People say that a smile can be passed from one person to another, but acts of kindness from strangers

are even more so. This experience has had a spreading effect in our lives because it strengthened our

faith in humanity as a whole. And it has influenced us to be more mindful of ways we, too, can share with

others. No matter how big or how small, an act of kindness shows that someone cares. And the results

can be everlasting.

1.Why was the bike so important to the couple?

A. They used it for work and daily life.

B. It was their only possession.

C. It was a nice Kona 18 speed.

D. The man's job was bike racing.

2.What does the underlined phrase mean?

A. go very far to see someone

B. walk out on foot to greet someone

C. help someone with one's best

D. enjoy the moment with someone

3.We can infer from the text that ________.

A. the couple worked 60 hours a week

B. people were busy before Christmas

C. the stranger brought over the bike

D. life was hard for the young family

4. How did people get to know the couple's problem?

A. From a stranger.

B. From a newspaper.

C. From TV news.

D. From radio broadcasts.

5.What do the couple learn from their experience?

A. Strangers are usually of little help.

B. One should take care of their bike.

C. News reports make people famous.

D. An act of kindness can mean a lot.

题型:单项选择题

表现为筋骨不坚、胸廓狭窄、肌肉瘦削、皮肤不荣、疲惫乏力者为()

A.体强

B.体弱

C.体轻

D.体瘦

E.体胖

题型:单项选择题

下列属于生态系统大型消费者的是 ( )

A.真菌

B.植物

C.肉食动物

D.细菌

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