当用数字万用表测量直流电路中的电流时,如果显示负值,说明电路中的电流()。A、数值太

题型:单项选择题

问题:

当用数字万用表测量直流电路中的电流时,如果显示负值,说明电路中的电流()。

A、数值太小

B、实际方向与测试方向相反

C、方向发生了变化

D、很难准确测定

考点:仪表工考试仪表维修工初级仪表维修工初级题库
题型:单项选择题

(26分)读所列材料,完成以下各题。

材料一 土耳其等高线地形图和土耳其首都安卡拉的气候资料表

安卡拉气候资料表(北纬40度,东经32.9度,海拔891米)

月 份123456789101112
平均气温℃0.11.96.111.215.519.622.922.618.312.67.12.6
降水量mm47.036.336.248.354.637.413.812.419.326.833.449.0
材料二 土耳其99%的居民信奉伊斯兰教。土耳其拥有的牲畜头数在中东国家居第一位,畜产品主要销往海湾等阿拉伯石油国家。

材料三 土耳其最大城市伊斯坦布尔于公元前658年始建,现拥有40多座博物馆,20座教堂,450多座清真寺。每年的5-7月伊斯坦布尔都要举行“国际艺术文化节”,每年都能吸引无数国际游客来此参观交流。

(1)土耳其的气候从西向东有明显的过渡性。读土耳其首都安卡拉的气候资料,请以安卡拉为例,分析此特征和成因。(10分)

(2)伊斯坦布尔每年5-7月的 “国际艺术文化节”都能吸引无数国际游客到来,请分析出现这一现象的原因。(8分)

(3)分析土耳其畜牧业比较发达的原因。(8分)

题型:单项选择题

阅读理解。

     Food is life; it gives us the nourishment (营养) we need to stay alive and be healthy. Usually, we eat

because we are hungry or need energy. Brian Wansink, a professor (教授) at the University of Illinois, says

we also eat certain (某种) foods because they make us feel good, and remind us of happy memories. Wansink

calls this kind of food comfort food. For some people, ice cream is a comfort food. For others, a bowl of

noodles makes them feel good.

     How does a food became comfort food? Professor Wansink believes that we connect food with important

times, feelings, and people in our lives, 'When I was a child, my mother made a delicious soup; I loved it.

Now, I often eat this soup when I am tired or worried, and it helps me feel better,' says one of Wansink's

friends.

     Do men and women choose different comfort foods? Wansink's research (研究) at the University of

Illinois says 'yes'. In his study, the favorite comfort for both men and women was ice cream. After this,

men usually preferred hot, delicious foods like soup or noodles. Women liked sweet things such as chocolate

and candies. Men and women like to eat comfort foods when they are happy, but women eat these foods

more when they are sad or worried.

1. According to the passage, a kind of food that makes us feel good is called ________.

A. fast food

B. healthy food

C. Chinese food

D. comfort food

2. In Wansink's study, both men and women like to eat ________.

A. soup

B. ice cream

C. noodles

D. chocolates

3. The passage implies (暗示) that ________.

A. men probably eat more comfort foods than women

B. women usually eat comfort foods only when they are happy

C. men usually eat comfort foods when they are sad

D. women probably eat comfort foods more often than men

题型:单项选择题

销售毛利率又叫菜肴毛利率。

题型:单项选择题

水泵所具有的实际汽蚀余量与()无关。

A.泵吸入口的压强

B.流速

C.液体性质

D.泵的结构

题型:单项选择题

根据证券投资组合理论,在其他条件不变的情况下,如果两项贷款的收益率具有完全正相关关系,则该证券投资组合不能够分散风险。

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