动车组用胶囊,外风挡板

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问题:

动车组用胶囊,外风挡板

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2008年9月发生了“三鹿”婴幼儿奶粉受污染事件,致使不少婴幼儿出现肾结石病症.经分析,主要是不法分子从中添加了三聚氰胺(化学式为C3H6N6)来冒充蛋白质以提高奶粉的含氮量而造成的恶果.检测结果表明,合格奶粉的含氮量约为3%.请计算回答:

(1)三聚氰胺的相对分子质量是______.

(2)三聚氰胺含氮量是合格奶粉含氮量的______ 倍(精确到整数倍).

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12-year-old John Thomas Robertson is a born train fan. "I’ve liked trains probably from the day I was born," he told Good Morning America. "When I was very little," he said, "my grandpa got me a train model. I would just watch it go round for hours and hours."

When Robertson finally had the opportunity to ride on a train, he felt great. His journey was so mind-blowing that he couldn’t keep it to himself: he decided to take all his classmates to go on a ride with him. When he found that some of his classmates couldn’t pay the fare, he collected cans (罐子) and bottles and raised more than $1,000 for them.

That trip was such a happy one that he made it a yearly action. "It never gets boring for some reason; it’s just fun," he said. "It really lets people get away from their busy life and have fun.

Every October, Robertson takes a new group of children to ride on the train —but now, he has a problem. Several disabled children were refused because the train was not accessible (可用的) to disabled people. "He was angry to think that children of his own age couldn’t ride a train," his mother said.

But he wouldn’t say no: he recently sent a letter to the train office for help. To his surprise, the leader, Ty Pennington, accepted the letter in person. He said that he and his workers would work on making a train accessible to disabled people.

小题1:The first time John Thomas Robertson took a train, ________.

A.he was frightened by it

B.he acted as a driver

C.he watched it for hours

D.he fell in love with it小题2:The author says John Thomas Robertson is a born train fan, because he ________.

A.was greatly attracted to trains since early childhood

B.said so in Good Morning America

C.took a group of disabled children to travel by train

D.was taken to a train the day he was born小题3:The underlined words "mind-blowing" can be replaced by ________.

A.important

B.terrible

C.amazing

D.disappointing小题4:The disabled children were refused to get on the train because _________.

A.the trains then weren’t accessible to the disabled

B.Robertson had not saved enough money for the tickets

C.they couldn’t afford the train tickets

D.the driver would not allow them to do so小题5:According to the last paragraph, we can see that Robertson is a ________ child.

A.helpful and crazy

B.kind and clever

C.kind but boring

D.lazy but kind

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请简述“陶恭祖三让徐州”的故事(11、12回)

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在煤泥浮选生产过程中,拨开搅拌桶或矿浆准备器液面上的泡沫层,随手捞一下矿浆,这时即有部分煤粒粘在手上,手上黏着的煤粒多,手上露出的皮肤少,看不清手纹,则说明矿浆浓度()。

A、过大

B、过小

C、不变

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哪种病原体感染后脓液呈稀薄、淡红色?()

A.葡萄球菌

B.大肠埃希菌

C.链球菌

D.淋病奈氏菌

E.衣原体

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