与常规塑性变形相比，超塑性变形具有哪些主要特征？

美国西部经济最发达的地区是[ ]

A．华盛顿州

B．加利福尼亚州

C．内华达州

D．犹他州

关于定量研究与定性研究方法的区别，以下说法正确的是（）。

A.定性研究需要的样本量一般要比定量研究的大

B.定性研究以客观为主，定量研究以主观为主

C.定性研究常用于理论构建，而定量研究常用于理论检验

D.定性研究偏于统计分析，定量研究倚重于描述分析

E.定性研究属于演绎分析，定量研究属于归纳分析

在近代史上，曾经割占中国领土的国家有

①法国 ②美国 ③日本 ④英国 ⑤俄国 [ ]

A、①②③

B、③④⑤

C、①③⑤

D、②③④

发酵粉是一种生产面制品和膨化食品的化学膨松剂，由小苏打、臭粉(碳酸氢铵)、明矾中的两种物质组成。某研究性学习小组为探究不同品牌的发酵粉的化学成分，进行如下实验。

【提出假设】

（1）假设1：由小苏打和臭粉组成；

假设2：由小苏打和明矾组成；

假设3：由________________组成。

【方案与流程】

为探究某品牌的发酵粉的化学成分，某同学设计如下实验，得到如下现象：

（2）该发酵粉的成分为________ (填化学式）。

（3）另一品牌的发酵粉的化学组成可能为假设2情况，请你设计实验验证，写出实验步骤、预期现象和结论。

实验步骤	预期现象结论
1．取少量样品溶于稀盐酸后，将溶液分成两份
2．                                      _______________________________________
3．                                      ________________________________________

 

（4）另一品牌的发酵粉的化学组成为小苏打和碳酸氢铵，为探究其化学式[化学式可表示为nNaHCO₃·m NH₄HCO₃]，称取4.05 g该产品在烧杯中溶解后，移入________配成100 mL溶液，用移液管取25.00mL溶液，滴加足量盐酸，生成的气体通入过量澄清石灰水中，生成的白色沉淀经干燥，称量为1.25 g。则该发酵粉的化学式为                   。

（相对分子质量：NaHCO₃：84   NH₄HCO₃：79   CaCO₃：100）

Questions 51-55 are based on the following passage.

To Err is Human

by Lewis Thomas
Everyone must have had at least one personal experience with a computer error by this time. Bank balances are suddenly reported to have jumped from $ 379 into the millions, appeals for charitable contributions are mailed over and over to people with crazy sounding names at your address, department stores send the wrong bills, utility companies write that they’re turning everything off, that sort of thing. If you manage to get in touch with someone and complain, you then get instantaneously typed, guilty letters from the same computer, saying, "Our computer was in error, and an adjustment is being made in your account."
These are supposed to be the sheerest, blindest accidents. Mistakes are not believed to be the normal behavior of a good machine. If things go wrong, it must be a personal, human error, the result of fingering, tampering a button getting stuck, someone hitting the wrong key. The computer, at its normal best, is infallible.
I wonder whether this can be true. After all, the whole point of computers is that they represent an extension of the human brain, vastly improved upon but nonetheless human, superhuman maybe. A good computer can think clearly and quickly enough to beat you at chess, and some of them have even been programmed to write obscure verse. They can do anything we can do, and more besides.
It is not yet known whether a computer has its own consciousness, and it would be hard to find out about this. When you walk into one of those great halls now built for the huge machines, and standing listening, it is easy to imagine that the faint, distant noises are the sound of thinking, and the turning of the spools gives them the look of wild creatures rolling their eyes in the effort to concentrate, choking with information. But real thinking, and dreaming, are other matters. On the other hand, the evidence of something like an unconscious, equivalent to ours, are all around, in every mail. As extensions of the human brain, they have been constructed the same property of error, spontaneous, uncontrolled, and rich in possibilities.

The author uses his hypothesis that "computers represents an extension of the human brain" in order to indicate that ______.

A. human beings are not infallible, nor are computers
B. computers are bound to make as many errors as human beings
C. errors made by computers can be avoided the same as human mistakes can be avoided
D. computers axe made by human beings and so are their errors