制冷压缩机吸气温度低于应有的温度的原因是()。A.热力膨胀阀的开启度过小 B.冷藏库

题型:单项选择题

问题:

制冷压缩机吸气温度低于应有的温度的原因是()。

A.热力膨胀阀的开启度过小

B.冷藏库热负荷减少

C.蒸发器的表面结霜过少

D.制冷剂充入过多

考点:制冷设备维修工中级制冷设备维修工中级制冷设备维修工题库
题型:单项选择题

48岁妇女,绝经1年, * * 少许接触出血,查:子宫颈中度糜烂,宫体稍小,子宫颈刮片检查2次均阳性, * * 镜下宫颈活检阳性,应选择哪种方法排除子宫颈癌

A.分段诊刮
B.随访
C.染色体检查
D.子宫颈锥形切除
E.子宫腔冲洗液诊断

题型:单项选择题

—The shirt looks different from others and it's nice.          

—Thanks.  It ________ by my mother last month.      [ ]

A. made                            

B. was made      

C. is made                          

D. has been made

题型:单项选择题

地球是我们赖以生存的“家园”,大气层是这个家园的保护伞,没有它,人类将无法生存,请你设想一下,如果地球周围没有大气层,以下的现象、实验和实例,哪些将不再发生(  )

A.用天平称物体质量

B.水往低处流

C.塑料吸盘贴在光滑墙壁上

D.连通器液面保持相平

题型:单项选择题

婴儿期的定义是

A.出生至满1周岁
B.出生至满1岁前
C.从新生儿期结束至满1岁
D.从新生儿期结束至满1岁前
E.从脐带结扎至未满1岁

题型:单项选择题

Questions 84-90 are based on the following passage.
Imagine a society in which cash no longer exists. Instead "cash" is electronic, as in bankcard systems. Currency and coin are abandoned. The immediate benefits would be profound and fundamental. Theft of cash would become impossible. Bank robberies and cash-register robberies would simply cease to occur. Attacks on shopkeepers, taxi drivers, and cashiers would all end. Purse snatchings would become a thing of the past. Urban streets would become safer. Retail shops in once-dangerous areas could operate in safety. Security costs and insurance rates would fall. Property values would rise. Neighborhoods would improve.
Drug traffickers and their clients, burglars and receivers of stolen property, arsonists for hire, and bribe-takers would no longer have the advantage of using untraceable currency. Electronic "money" would leave incriminating wails of data, resulting in more arrests and convictions. These prosecutions, in turn, would inhibit further crimes.
The impact of the monetary change on underground economies would be nearly as dramatic as the effect on crime. In the United States, the underground economy is estimated at between 10% and 28% of the gross national product. Internal Revenue Service (IRS) researches suggest that almost all hidden labor is paid in currency.
In a society devoid of physical money, a change from cash to recorded electronic money would be accompanied by a flow of previously unpaid income-tax revenues running in the tens of billions of dollars. As a result, income-tax rates could be lowered and the national debt reduced.
Cash has been the root of much social and economic evil. The emergence of electronic funds-transfer technology makes it possible to change the nature of money and to divorce it from evil. Eighty percent of Americans regularly use credit cards. The development of a federal system to handle the country’ s 300 billion annual cash transactions in the United States electronically is within reach.
A national electronic-money system would operate as debit-card system. Each individual’s "money" would be held in his money-system account. A transaction would effect an instant transfer of "money" from his account to that of another account holder.
The principal differences between a national electronic-money system and commercial bank-card systems would be: the money system would be federally operated; payment would constitute "legal tender"; system-account holders would be able to receive as well as pay out funds by use of their accounts; and funds would be transferable between private-account holders as well as between merchants and private-account holders.
Only cash would be supplanted by electronic money. The use of checks, drafts, money orders, traveler’s checks, cashier’s checks, as well as letters of credit, acceptances, and other financial instruments would remain in regular use. Credit card and automatic-teller-machine systems (ATMs) would not necessarily change, although you could no longer obtain cash at ATMs.

According to the author, we must change ______.

A.the forms of the money in order to catch thieves and robbers

B.the nature of money in order to root out the cause of evils

C.the availability of money so that evils can be stopped

D.the use of money so that income-tax can be reduced

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