下列哪项不是层流的超声多普勒频谱表现() A.频谱窄 B.频谱充填 C.出现空窗 D

题型:单项选择题 A型题

问题:

下列哪项不是层流的超声多普勒频谱表现()

A.频谱窄

B.频谱充填

C.出现空窗

D.频谱包络线光滑

E.频谱速度正常

考点:医学临床三基(医技)医学影像学(超声医学)医学影像学(超声医学)题库
题型:单项选择题 A型题

蓄压器气囊顶部和大气是连同的。()

题型:单项选择题 A型题

卡马西平在体内可发生()

A.羟基化代谢

B.环氧化代谢

C.N-脱甲基代谢

D.S-氧化代谢

E.脱S代谢

题型:单项选择题 A型题

如图所示电路中的变压器为理想变压器,S为单刀双掷开关。P是滑动变阻器R的滑动触头,U1为加在原线圈两端的交变电压,I1、I2分别为原线圈和副线圈中的电流。下列说法正确的是

[ ]

A.保持P的位置及U1不变,S由b切换到a,则R上消耗的功率减小

B.保持P的位置及U1不变,S由a切换到b,则I2减小

C.保持P的位置及U1不变,S由b切换到a,则I1增大

D.保持U1不变,S接在b端,将P向上滑动,则I1减小

题型:单项选择题 A型题

(四)

Large companies need a way to reach the savings of the public at large. The same problem, on a smaller scale, faces practically every company trying to develop new products and create new jobs. There can be little hope of raising the money needed from friends and people we know, and while banks may agree to provide short-term finance, they are generally unwilling to provide money, for long-term projects. So companies turn to the public’ inviting people to lend them money, or take a share in the business in exchange for a share in future interests. This they do by issuing stocks and shares in the business through the Stock Exchange. By doing so they can put into circulation the savings of single persons and institutions, both at home and abroad.

When the saver needs his money back, he does not have to go to the company with whom he originally placed it. Instead he sells his shares through a stockbroker to some other Saver who is seeking to invest his money.

Many of the services needed both by industry and by each of us are provided by the government or by local organizations. Without hospitals, roads, electricity, telephones and railways, this country could not work. All these require continuous spending on new equipment and new development if they are to serve us properly, requiring more money than’ it is raised through taxes alone. The government, local organizations and nationalized industries therefore frequently need to borrow money to finance: major capital spending, and they, too, come to the Stock Exchange.

There is hardly a man or woman in this country whose standard of living does not depend on the ability of his or her employers to raise money to finance new development. In one way or another his new money must come from the savings of the country; The Stock Exchange exists to provide a channel through which these savings, can reach those who need finance.

The money which enables these companies to go ahead with their projects is().

A.exchanged for part ownership in the Stock Exchange

B.raised by the selling of shares in the companies

C.repaid to its original owners as soon as possible

D.invested in different companies in the Stock Exchange

题型:单项选择题 A型题

( )是WTO主要协议的最大特点。

A.非歧视原则

B.市场开放原则

C.公平贸易原则

D.权利与义务平衡原则

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