激光的空间相干性和方向性都与什么相联系()?A、纵模结构 B、横模结构 C、镜面的

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问题:

激光的空间相干性和方向性都与什么相联系()?

A、纵模结构

B、横模结构

C、镜面的大小

考点:激光能激光原理激光原理题库
题型:单项选择题

劳动保护,概括地说就是保护劳动者在生产劳动过程中的各种福利待遇。

题型:单项选择题

阅读理解

     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 to 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 some day I'll build one for you." The clerk 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 round-trip 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 the Fifth Avenue and 34th Street. He

then pointed to a great new building there, a pale reddish stone one, 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

Waldorf-Astoria 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. Which of the 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.

2. The underlined word "conventions" in Para. 3 can be replaced by ___________?

A. rooms        

B. buildings          

C. meetings        

D. hotels

3. 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.  

D. One good turn deserves another

题型:单项选择题

公司承接了一个大型信息系统集成项目,项目参加人员121人,估计这一项目将在3年内建成。公司在开始这一项目之前,要决定这个项目的财务经济效益,并考虑资金的时间价值,则采用()对项目进行财务绩效评估最合适。

A.投资收益率法

B.投资回收期法

C.追加投资回收期法

D.内部收益率法

题型:单项选择题

成材率是合格品重量与所用原料重量的比值。

题型:单项选择题

注册咨询工程师(投资)在主持项目咨询业务过程中,应善于团队的______,依靠集体力量,集中大家的智慧,完成工作任务,实现工作目标。

A.联系和协调
B.组织和协调
C.联系和组织
D.组织和沟通

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