单参数控制系统中,调节阀的气开为+A,气关阀为-A,调节阀开大被调参数上升为+B,下

题型:多项选择题

问题:

单参数控制系统中,调节阀的气开为+A,气关阀为-A,调节阀开大被调参数上升为+B,下降为-B,则()。

A.A*B=+,调节器选正作用

B.A*B=+,调节器选反作用

C.A*B=-,调节器选正作用

D.A*B=-,调节器选反作用

考点:合成氨生产工合成氨生产工高级合成氨生产工高级题库
题型:多项选择题

下列各种分步法中,半成品成本不随实物转移而结转的方法是()

A.综合结转分步法

B.按计划成本综合结转法

C.平行结转分步法

D.分项结转法

题型:多项选择题

多动物定时长途迁徙的原因主要是( )。

A.繁衍后代的需要

B.获取食物的需要

C.追求适合生存和生长的温度

D.通过长途艰苦迁徙,淘汰同类中的弱者,优化种群

题型:多项选择题

读“我国某省1953~2010年人口数据统计表”,完成1—2题。

1、从表格中可以得出,该省在1990~2010年期间[ ]

A.家庭户数呈减少势头

B.人口自然增长率在上升

C.社会负担明显加重

D.城市化速度逐渐加快

2、该省城乡人口结构的变化可能产生的结果有[ ]

A.出现粮食短缺

B.耕地面积减少

C.产生逆城市化现象

D.出现严重的环境污染

题型:多项选择题

在水准测量一个测站上,已知仪器的视线高为2856.458,测得前视点的读数为1.342,则可求得前视点的高程为()。

A、2855.116

B、-2855.116

C、2857.800

D、-2857.800

题型:多项选择题

Shopping for clothes is not the same experience for a man as it is for a woman. A man goes shopping because he needs something. He knows what he wants, and his purpose is to find it and buy it, the price is a less important consideration. All men simply walk into a shop and ask the assistant for what they want. If the shop has it, the salesman immediately produces it, and the business of trying it on is done at once. All being well, the bargain (交易) can be and often is completed in less than five minutes, with hardly any chat and to everyone’s satisfaction.
For a man, slight problems may begin when the shop does not have what he wants. Then the salesman tries to sell the customer (顾客) something else he offers the nearest he can to the thing required. He usually says, "I know this jacket is not the style (式样) you want, sir, but would you like to try it on for size It happens to be the color you wanted." Few men have patience with this treatment, and the usual reply is: "This is the right colour and may be the right size, but I should be wasting my time and yours by trying it on."
Now how does a woman go about buying clothes She does so in the opposite way. She has never fully made up her mind what she wants, and she is only "having a look round". She is always open to persuasion, indeed she considers of great importance what the saleswoman tells her, even what her friends tell her. She will try on any number of things. Highest in her mind is the thought of finding something that everyone thinks suits her. Most women have an excellent sense (判断力) of value when they buy clothes. They are always trying to find an unexpected bargain. Faced with a roomful of dresses, a woman may easily spend an hour going from one counter (柜台) to another before selecting the dresses she wants to try on. It takes a great deal of time but gives great joy. Most dress shops supply chairs for the waiting husbands.

When a man cannot get what he wants, he ______.

A. buys something of the same color in a slightly different style
B. usually does not buy anything
C. will try on some other clothes of the same style
D. wastes no time in buying something else

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