有一个电热水壶,铭牌如右表所示.(不计热量的损失)求: (1)将质量为2kg、温

题型:问答题

问题:

有一个电热水壶,铭牌如右表所示.(不计热量的损失)求:

(1)将质量为2kg、温度为20℃的一壶冷水,加热到100℃,水吸收的热量多少?【水的比热容为4.2×103J/(kg•℃)]

(2)电热水壶正常工作多长时间才能把这壶水加热到100℃?

    电热水壶型号:91440
  电压:220V  频率:50Hz
功率:1000W  最大水量:2kg

考点:热量的计算电压、额定电压电功或电能的计算电功率,额定功率
题型:问答题

白细胞分类计数中的参考范围

嗜酸性粒细胞为

A.0.50~0.70 (50%~70%)
B.0.01~0.05(1%~5%)
C.0~0.01(0%~1%)
D.0.20~0.40 (20%~40%)
E.0.03~0.08(3%~8%)

题型:问答题

阅读理解。

     When I was a child, I often dreamed of the time when I could leave home and escape to the city. We lived

on a farm. In the winter especially, we wear quite out off from the outside world. As soon as I left school, I

packed my bags and moved to the capital. However, I soon discovered that my life has its too.

     One big disadvantage is money. It costs so much to go out, not to mention basics like food and housing.

Another disadvantage is pollution. I suffer from asthma (哮喘), and the air is so that I am afraid to go outside.

Then there is the problem of traveling round. Although I have a car, I seldom use it became of the traffic jams.

One choice is to go by bicycle, but that can be quite dangerous.

     Of course there are advantages. First, there is so much to do in the city, whatever you tastes in culture or

entertainment (娱乐活动). Besides, there are wonderful jobs and greater chances of moving to a more important

job or position. Finally, if you like shopping, the variety of goods is very surprising-and, what is more, shops

are often only a short walk away.

     Is life better then, in the city? Perhaps it is, when you are in your teens (十几岁) or twenties. However, as

you get older, and especially if you have small children, the peace of the countryside may seem preferable. I

certainly hope to move back there soon.

1. What was the writer always thinking about when he was a child?

A. Staying on the farm.

B. Moving to the countryside.

C. Leaving home for the city.

D. Running away from the school.

2. Which of the following is true about the writer?

A. He is very old now.

B. He is in good health.

C. He prefers driving a car.

D. He lives in the city now.

3. In the passage, the writer tries to _____.

A. express his opinions about way of life

B. describe his life in the countryside

C. an interest in the outside world

D. persuade the reader to live in the city

4. How is the passage mainly developed?

A. By inferring.

B. By comparing.

C. By listing examples.

D. By giving explanations.

题型:问答题

有关膝关节半月板的描述,错误的是()

A.半月板是位于股骨和胫骨关节面之间的纤维软骨板

B.半月板周缘厚,内缘薄

C.半月板上面平坦,下面凹陷

D.两端借韧带附着于胫骨髁间隆起

E.两侧半月板的前端借膝横韧带相连

题型:问答题

车辆的轴载重量认定标准:2型轴——单轴双轮()吨。

A.7

B.10吨

C.17吨

D.25吨

题型:问答题

患者,男,67岁,左上颌缺失,余留牙稳固。要求可摘义齿修复。

不起间接固位作用的结构是()

A.连续卡环

B.支托

C.舌板

D.舌杆

E.腭板

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