配备甚高频无线电话的船舶在航时,应当在()频道上正常守听。①规定的;②通用的;③大家

题型:单项选择题

问题:

配备甚高频无线电话的船舶在航时,应当在()频道上正常守听。①规定的;②通用的;③大家都熟知的。

A.①

B.②

C.③

D.①②③都不对

考点:经济学经济学题库
题型:单项选择题
2013年3月2日,国家环保部发布了新修订的《环境空气质量标准》.其中规定:居民区的PM2.5年平均浓度不得超过35微克/立方米,PM2.5的24小时平均浓度不得超过75微克/立方米. 某城市环保部门随机抽取了一居民区去年20天PM2.5的24小时平均浓度的监测数据,数据统计如下:
组别
PM2.5浓度
(微克/立方米)
频数(天)
频率
 第一组
(0,25]
5
0.25
第二组
(25,50]
10
0.5
第三组
(50,75]
3
0.15
第四组
(75,100)
2
0.1
(Ⅰ)从样本中PM2.5的24小时平均浓度超过50微克/立方米的5天中,随机抽取2天,求恰好有一天PM2.5的24小时平均浓度超过75微克/立方米的概率;
(Ⅱ)求样本平均数,并根据样本估计总体的思想,从PM2.5的年平均浓度考虑,判断该居民区的环境是否需要改进?说明理由.
题型:单项选择题

The Rolls Royce logo consisting of the two Rs clearly stands for Rolls and Royce, the two founders of this car manufacturing company.

In 1884 Frederick Henry Royce started an electrical and mechanical business. He made his first car, a “Royce”, in his Manchester factory in 1904. He was introduced to Charles Steward Rolls in a Manchester hotel on May 4 that year, and the pair agreed a deal where Royce would manufacture cars, to be sold by Rolls. A clause (条款) was added to the contract, saying the cars would be called “Rolls Royce”.

The current Toyota logo consists of three ovals: the two perpendicular (成直角的) ovals represent a relationship of trust between the customer and Toyota. These ovals combine to symbolize the letter “T” for Toyota. The space in the background implies a global expansion of Toyota’s technology and unlimited potential for the future.

The Hyundai Motor Company (HMC) is a South Korean company manufacturing automobiles. Their automobiles are available in many countries around the globe. In 2003 it was South Korea’s largest car maker and the world’s seventh largest car maker. The Hyundai logo appears to be an H (symbolizing Hyundai). The oval shape indicates the company’s global expansion and the “H” is symbolic of two people (specifically the company and customer) shaking hands.

The Mercedes-Benz logo represents one of the most famous brands in the world. The Benz logo is a three-pointed star that represents its domination of the land, the sea, and the air. The famous three-pointed star was designed by Gottlieb Daimler to show the ability of his motor for land, air and sea usage. It was first seen on a Daimler in 1909 and was combined with the Benz laurel wreath (桂冠) in 1926 to symbolize the union of the two firms. Mercedes-Benz is one of the world’s oldest automobile manufacturers.

小题1:Which company’s logo is a symbol of two people shaking hands?

A.Rolls Royce’s.

B.Toyota’s.

C.Hyundai’s.

D.Mercedes-Benz’s小题2:According to the text, _______________.

A.Rolls Royce was founded in 1884

B.Mercedes-Benz originally produced motors

C.Toyota is having difficulty expanding its technology

D.Hyundai has the same long history as Mercedes-Benz小题3:Which company’s logo stands for both the manufacturer and the seller?

A.Rolls Royce’s.

B.Toyota’s.

C.Hyundai’s.

D.Mercedes-Benz’s.小题4:We can learn from the text that ______.

A.the ovals in the logos have the same meaning

B.Hyundai is South Korea’s seventh largest car maker

C.the three-pointed star of the Mercedes-Benz logo was first seen in 1926

D.the Mercedes-Benz logo is a symbol of the combination of two companies

题型:单项选择题

当某工程网络计划的计算工期等于计划工期时,该网络计划中的关键工作是指( )的工作。

A.时标网络计划中没有波形线
B.与紧后工作之间时间间隔为零
C.开始节点与完成节点均为关键节点
D.最早完成时间等于最迟完成时间

题型:单项选择题

pKa大于4.0有利于直肠黏膜吸收的为()

A.脂溶性药物

B.水溶性药物

C.酸性药物

D.碱性药物

E.难溶性药物

题型:单项选择题

保险公司稳健经营的基本原则是()。

A.大数法则和收支平衡原则

B.保险利益原则和近因原则

C.最大诚信原则和补偿原则

D.代位追偿原则和分摊原则

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