下列叙述中正确的是( ) A.含有离子键的化合物一定是离子化合物 B.具有共价键

题型:选择题

问题:

下列叙述中正确的是(  )

A.含有离子键的化合物一定是离子化合物

B.具有共价键的化合物一定是共价化合物

C.在化合物CaCl2中,两个氯离子之间也存在离子键

D.化学键是分子中多个原子之间强烈的相互吸引作用

考点:共价键离子化合物
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根据《劳动法》的规定,劳动合同期限不满3个月的不得约定试用期。( )

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法律和道德的关系问题是贯穿整个法理学、法哲学的问题,是法理学的核心问题。下列关于法律和道德的区别和联系正确的有哪些?()

A.就上层建筑而言,法律和道德属于相同的范畴,法律是一种制度,道德是一种社会意识

B.道德在原始社会作为独立的或者与宗教、习俗相混合的形态而存在,法律在原始社会中也与宗教、习俗有十分密切的联系

C.法律与道德存在交叉与渗透,法律规范与道德规范的调控范围也有所重叠

D.道德是法律的评价标准和推动力量

题型:选择题

软黏土的特性指标如下,请判定其中()指标是肯定有问题的。

A.无侧限抗压强度10kPa

B.静力触探比贯入阻力值30kPa

C.标准贯入锤击数8击/30cm

D.剪切波速100m/s

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I have a rule for travel: Never carry a map. I prefer to ask for directions.

Foreign visitors are often puzzled in Japan because most streets there don’t have names. In Japan, people use landmarks in their directions in stead of street names, For example, the Japanese will say to travelers, “Go straight down to the corner. Turn left at the big hotel and go past a fruit marks. The post office is across from the bus stop. ”

In the countryside of the American Midwest, usually there are not many landmarks. There are no mountains, so the land is very flat. In many places there are no towns or buildings within miles. Instead of landmarks, people will tell you directions and distance. In Kansas or Iowa, for example, people will say, “Go north two miles. Turn east, and then go another mile.”

People in Los Angeles, California, have no idea of distance on the map. They measure distance by means of time, not miles. “How far away is the post office?” You ask, “Oh,” They answer, “It’s about five minutes from here.” You say, “Yes, but how many miles away is it?” They don’t know.

People in Greece sometimes do not even try to give directions because visitors seldom understand the Greek language. Instead of giving you the direction, a Greek will often say, “Follow me.” Then he’ll lead you through the streets of the city to the post office.

Sometimes a person doesn’t know the answer to your question. What happens in this situation? A New Yorker might say, “Sorry, I have no idea.” But in Yucatan, Mexico, no one answers, “I don’t know.” People in Yucatan think that “I don’t know.” is impolite. They usually give an answer, often a wrong one. A visitor can get very, very lost in Yucatan!

One thing will help you everywhere --- in Japan, in the United States. In Greece, in Mexico, or in any other place. You might not understand a person’s words, but maybe you can understand his body language. He or she will usually turn and then point in the correct direction. Go in that direction, and you may find the post office!

1 The passage mainly tell us that ____ .

A. never carry a map for travel

B. there are not many landmarks in the American Midwest

C. there are different ways to give directions in different parts of the world

D. New Yorkers often say, “I have no idea,” but people in Yucatan, Mexico, never say this

2 The passage says, “In Japan, people use landmarks in their directions. “The word “landmarks” means ____ .

A. building names

B. street names

C. hotels, markets and bus stops

D. buildings or places which are easily recognized

3 In which place do people tell distance by means of time?

A. Japan  B. American Midwest    C. Los Angeles, California    D. Greece

4 In the passage, ____ countries are mentioned by the writer.

A. seven  B. four    C. eight   D. five

5 Which of the following is wrong?

A. Travelers can learn about people’s customs by asking questions about directions.

B. A person’s body language can help you understand directions.

C. People in some places give directions in miles, but people in other places give directions by means of time.

D. People in different places always give directions in the same way: They use street names.

题型:选择题

使用反循环钻机时,应将钻头提离孔底约(),待泥浆循环畅通方可开始钻进。

A、20cm

B、30cm

C、10cm

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