用挤出、注射等方法制出管状型坯,然后将压缩空气通入处于热塑状态的型坯腔中,使其膨胀成

题型:单项选择题

问题:

用挤出、注射等方法制出管状型坯,然后将压缩空气通入处于热塑状态的型坯腔中,使其膨胀成为所需形状的塑料制品的方法是______。

A.挤出成型

B.滚塑成型

C.压延成型

D.吹塑成型

考点:工艺美术设计师三级工艺美术设计材料与加工工艺
题型:单项选择题

妊娠90天行钳刮术中,患者突然烦躁不安,咳嗽、胸闷、呼吸困难、发绀、心率加快,血压下降,应考虑()

A.人工流产综合反应

B.羊水栓塞

C.空气栓塞

D.子宫穿孔

E.出血过多

题型:单项选择题

Dear Economist,

My newly-wedded wife and I are deeply in love. There is, however, one issue that threatens the happiness of our marriage. I absolutely insist on shopping at Walmart. My wife, meanwhile, would rather avoid Walmart at all costs.

  I have recently tried to convince her that not only does Walmart offer the lowest prices known to man, but that the chain is also a force for good―lower prices mean better standards of living for all consumers, increased global trade means a tighter-knit(紧密团结的) international community, and efficient operations translate into higher productivity growth for the economy. My wife complains about poor labour policies, the “fact” that Walmart squeezes suppliers, and that it puts local shops out of business.

  Who is right? Will our marriage survive?

                                                                                                                                                    Brian Gee

Dear Brian,

I have to agree with you about Walmart. Jason Furman, then an economist at New York University, now an adviser to President Obama, famously argued in 2005 that Walmart was unwittingly (不知不觉地) a progressive success story. The chain’s prices don’t much affect me (I prefer Whole Foods) but Furman estimated that they benefited low-and-middle-income Americans to the sum of around $250 billion a year.

  Walmart does not pay much, so it may depress wages. Then again, it may increase wages by offering jobs to the otherwise-unemployed. Either way, the benefits of low prices to Walmart shoppers far outweigh any seemingly reasonable costs to Walmart employees. And while it is true that Walmart employees tend to be poor, the same is true of Walmart shoppers.

  Armed with this information you can face your wife with confidence. You are sure to win the conversation. The divorce is likely to be more argued.

Economist

68. What concerns Brian Gee so much that he wrote the letter?

A. His wife refuses to shop at Walmart.

B. They are faced with a divorce.

C. They can’t afford the costs of shopping at Walmart.

D. They are in conflict about shopping at Walmart. 

69. Brian Gee’s wife tends to hold the opinion that _________.

A. it is wrong for Walmart to depress its employees’ wages

B. consumers’ lives have improved thanks to Walmart

C. Walmart’s business operation increases productivity in economy

D. Walmart’s business increases global trade

70. What can be inferred from the reply letter?

A. Some employees accept the low pay to keep the job.

B. Walmart appeals to only poor consumers and poor employees.

C. Employees suffer from Walmart’s low prices more than consumers.

D. Jason Furman, a New York University economist, spoke highly of Walmart.

题型:单项选择题

唾液对龋病有免疫作用,具有吞噬作用是因为其含有()

A.变酶

B.液小体

C.氨盐和硫氰酸盐

D.分泌型免疫球蛋白A(SIgA.

E.溶菌酶

题型:单项选择题

选择适当的内容填充,使下面的程序段的功能与下列语句Y=IIF(X=0,0,IIF(X>0,1,-1))等效  IF   ①  Y = 1  ELSE  IF X = 0  ②  ELSE  ___③_______  ENDIF  ENDIF

题型:单项选择题

EEC同飞机、发动机有大量接口,其输入:().

A.有模拟量,离散量,频率量,数据总线的输入量

B.全部为数字信号

C.仅仅开关量

D.全是序列数据

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