铜合金管横向凸凹度深度不得大于()。A、0.2mm B、0.25mm C、0.3mm D、

题型:单项选择题

问题:

铜合金管横向凸凹度深度不得大于()。

A、0.2mm

B、0.25mm

C、0.3mm

D、0.35mm

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题型:单项选择题

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     One stormy night many years ago,an elderly man and his wife entered the hall of a small hotel in

 Philadelphia.Trying to get out of the rain,they came the front desk hoping to get some shelter for the night.

     "Could you possibly give us a room here?" the husband asked.

     The clerk,a friendly man with a winning smile,looked at the couple and explained that there were three

conventions in town."All of our rooms are taken," the clerk said."But I can't send a nice couple like you out into the rain at one o'clock in the morning.Would you perhaps be willing to sleep in my room?It's not

exactly a suite,but it will be good enough to make you folks comfortable for the night."

     When the couple declined,the young man pressed on."Don't worry about me;I'll make out just fine.

" the clerk told them.So the couple agreed.

     As he paid his bill the next morning,the elderly man said to the clerk,"You are the kind of manager who should be the boss of the best hotel in the United States.Maybe someday I'll build one for you." The

looked at them and smiled.The three of them had a good laugh.As they drove away,the elderly couple

agreed that the helpful clerk was indeed exceptional,as finding people who are both friendly and helpful

isn't easy.

     Two years passed.The clerk had almost forgotten the incident when he received a letter from the old

man.It recalled that stormy night and enclosed a roundtrip ticket to New York,asking the young man to

pay them a visit.

     The old man met him in New York,and led him to the corner of Fifth Avenue and 34th street.He then

pointed to a great new building there,a pale reddish stone,with turrets and watchtowers thrusting up to the sky."That," said the older man,"is the hotel I have just built for you to manage." "You must be joking," the

young man said."I can assure you I am not,"said the older man,a sly smile playing around his mouth.

     The older man's name was William Waldorf Astor,and that magnificent structure was the original

WaldorfAstoria Hotel.The young clerk who became its first manager was George C.Boldt.This young

clerk never foresaw the turn of events that would lead him to become the manager of one of the world's

most glamorous hotels.

1. The purpose of the following author writing this story is to________.

A. give people a good laugh

B. cover some facts

C. promote the business of WaldorfAstoria Hotel

D. deliver a lesson

2. Which of the following statements about the story is NOT true ?

A. The story took place at about one a.m..

B. The old couple was too poor to afford a luxurious room.

C. The clerk was willing to help those in need.

D. The clerk received an unexpected invitation from the old man.

3. The underlined word "conventions" in Para 3.can be replaced by________.

A. rooms    

B. suites

C. meetings    

D. hotels

4. Which of the following proverbs suits the story the best?

A. Every little thing helps.

B. Make hay while the sun shines.

C. Man proposes;God disposes (处理,决定).

D. One good turn deserves another.

题型:单项选择题

关于急性上呼吸道感染的描述,以下哪些是正确的()

A.是鼻腔、咽或喉部急性炎症的概称

B.常见病原体为病毒

C.一般病情较轻,病程较短

D.具有一定传染性

E.发病率低

题型:单项选择题

属于不稳定型脊柱骨折的是()

A.腰椎横突骨折

B.单纯椎体楔形压缩骨折

C.铲土时骨折

D.Chance骨折

E.椎体前柱纵裂骨折

题型:单项选择题

世界银行贷款项目的建设周期中各工作阶段的正确顺序是( )。

A.项目选定、项目评估、项目准备、项目谈判、项目实施、项目总结评价

B.项目评估、项目选定、项目谈判、项目准备、项目实施、项目总结评价

C.项目选定、项目准备、项目评估、项目谈判、项目实施、项目总结评价

D.项目评估、项目选定、项目准备、项目谈判、项目实施、项目总结评价

题型:单项选择题

葡萄生长需要强光照、适宜温度,春季大棚中的弱光、低温条件影响其生长。科研人员在不同低温条件下研究葡萄幼苗相关生理指标的变化,为葡萄的大棚栽培提供理论依据。实验的基本步骤如下:

①挑选长势相同、具有5~6片真叶的某种葡萄幼苗平均分成三组,分别在常温25℃、低温15℃及5℃的环境中培养8天,然后恢复常温培养4天。

②在培养的0、2、4、6、8天和恢复常温培养的第2(R2)天、第4(R4)天,进行各项生理指标测定。

③记录实验结果(如下图所示),并对实验结果进行统计分析。

请回答下列问题。

本实验中的对照组是();研究中测定的内容是()。

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