在下列情况下,物体的比热容不发生变化的是[ ] A.给酒精中加水,稀释酒精 B.

题型:选择题

问题:

在下列情况下,物体的比热容不发生变化的是[ ]

A.给酒精中加水,稀释酒精

B.水凝结成冰

C.把铁块加工成铁钉

D.水中加盐变成盐水

考点:比热容的概念
题型:选择题

下列会计科目属于成本类的是( )。

A.管理费用

B.制造费用

C.待处理财产损溢

D.本年利润

题型:选择题

阅读理解

     As civilization proceeds in the direction of technology, it passes the point of supplying all the basic

essentials of life-food, shelter, clothes and warmth. Then we are faced with a choice between using

technology to provide and fulfill needs which have now been regarded as unnecessary or, on the other

hand, using technology to reduce the number of hours of work which a man must do in order to earn

a given standard of living. In other words, we either raise our standard of living above that necessary

for comfort and happiness or we leave it at this level and work shorter hours.

      I shall take it for granted that mankind has, by that time, chosen the latter alternative. Men will be

working shorter and shorter hours in their paid employment. It follows that the housewife will also

expect to be able to have more leisure in her life without lowering her standard of living. It also follows

that human domestic servants will have completely ceased to exist. Yet the great majority of the

housewives will wish to be relieved completely from the routine operations of the home such as

scrubbing the floors or the bath of the cooker, or washing the clothes or washing up, or dusting or

sweeping, or making beds.

      By far the most logical step to relieve the housewife of routine is to provide a robot which can be

trained to the requirements of a particular home and can be programmed to carry out half a dozen or

more standard operations, when switched by the housewife.

1. As civilization develops in the direction of technology, ________.

A. the basic essentials of life must be supplied

B. it is important to supply the basic essentials of life

C. it is no longer so important as it was in the past to supply all the basic essentials of life

D. it is not necessary to supply the basic essentials of life

2. According to the author, we are faced with________.

A. the choice of providing and fulfilling our needs

B. the choice of using technology

C. the choice of earning a standard of living

D. a choice between using technology to provide and fulfill needs to reduce the number of working hours

3. What alternative will mankind have chosen in future?

A. To leave our standard of living at this level and work shorter hours.

B. To raise our standard of living.

C. To fulfill needs which have been regarded as unnecessary.

D. To lower our standard of living and work shorter hours.

4. Now most housewives wish to________.

A. stop doing their housework

B. do more housework to improve their life

C. get rid of the heavy burden of their housework

D. do only simple and light housework

5. It can be inferred that robots will be invented_________.

A. to take the place of housewives

B. to help manage a family

C. to do the routine of housework instead of human

D. to provide the daily necessities for man

题型:选择题

设备异常需紧急停运处理及设备故障停运抢修等由调度台批准的设备停电工作为()。

A.计划停电

B.临时停电

C.紧急停电

D.年月计划免申报停电

题型:选择题

根据《900/1800MHZTDMA数字蜂窝移动通信网工程验收规范》验收环境要求,室内工作温度和湿度应保持在()。

A.5~+35℃、20%~85%

B.10~+45℃、15%~90%

C.0~+35℃、15%~85%

D.5~+45℃、15%~85%

题型:选择题

B19、B22-2、B23型车,制动缸活塞行程规定为()。

A.105~125mm

B.120~130mm

C.130~150mm

D.150~160mm

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