一件衣服六折出售后，便宜了200元，原价______元．

A few years ago, in their search for ways to sell more goods, advertising men hit on a new and controversial gimmick. It is a silent, invisible commercial that, the ad men claim, can be rushed past the consumer’s conscious mind and planted in his subconscious—and without the consumer’s knowledge.

Developed by James Vicary, a research man who studies what makes people buy, this technique relies on the psychological principle of subliminal perception. Scientists tell us that many of the sights coming to or eyes are not consciously "seen" . We select only a few for conscious "seeing" and ignore the rest. Actually the discarded impressions are recorded in the brain though they are below the threshold of consciousness.

There’s little doubt in Vicary’s mind as to the subliminal ad’s effectiveness. His proof can be summed up in just two words: sales increase.

In an unidentified movie house not so long ago, unknown audiences saw a curious film program. At the same time, on the same screen on which the film hero was courting the heroine a subliminal projector was flashing its invisible commercials.

"Get popcorn," ordered the commercial for a reported one three-thousandths of a second every five seconds. It announced "Coca-Cola" at the same speed and frequency to other audiences. At the end of a six weeks trial, popcorn sales had gone up 57 percent, Coke sales 18 percent.

Experimental Films. Inc, says the technique is not new. It began research on subliminal perception in 1954. Experimental Films stresses that its equipment was designed for helping problematic students and treating the mentally ill. At NYU two doctors showed twenty women the projected image of an expressionless face. They told the subjects to watch the face for some change of expression. Then they flashed the word angry on the screen at subliminal speeds. Now the women thought the face looked unpleasant. When the word happy was flashed on the screen instead, the subjects thought the woman’s facial expression looked much more pleasant.

Subliminal techniques, its promoters believe, are good for more than selling popcorn. Perhaps the process can even be used to sell political candidates, by leaving a favorable impression of the candidate in the minds of the electorates subliminally.

How convincing are these invisible commercials Skeptical psychologists answer that they aren’t anywhere near as effective as the ad men would like to think they are. Nothing has been proven yet scientifically, says a prominent research man.

Subliminal techniques have NOT been used for ().

A. promoting sales

B. making commercials

C. curing mental illness

D. selling political candidates

某炼铁废渣中含有大量CuS及少量的铁和铁的化合物，工业上以该废渣为原料生产CuCl₂·2H₂O的流程如下

请回答下列问题：

（1）废渣中的铁在潮湿的空气中发生吸氧腐蚀，其正极反应式为___________________。

（2）高温煅烧时CuS发生的反应为：___CuS + __NaCl + __O₂→ ___CuCl₂ + ____Na₂SO₄，配平该反应方程式。

（3）调pH后铁元素生成滤渣的离子方程式为______________ 。

（4）试剂A最好选用下 * * 种物质中的________（填序号）：

a.NaClO      b.Cl₂       c.浓硫酸

理由是__________________。

（5）分析下图溶解度曲线回答：

①为了获得CuCl₂·2H₂O晶体，对滤液B进行的操作是：蒸发浓缩、_________、滤液冷却结晶、过滤得到产品。

②“冷却结晶”过程中，析出CuCl₂·2H₂O晶体的合适温度或温度范围是____________。

风机机舱中一共有几个震动传感器（）。

A、1

B、2

C、3

D、4

以下叙述中不正确的是

A) 在C程序中，逗号运算符的优先级最低
B) 在C程序中，APH和aph是两个不同的变量
C) 若a和b类型相同，在计算赋值表达式a=b后，b中的值将放入a中，而b中的值不变
D) 当从键盘输入数据时，对于整型变量只能输入整型数值，对于实型变量只能输入实型数值

附子在煎煮时宜（）

A.先煎

B.后下

C.包煎

D.烊化

E.另煎