在基面中测量的主切削刃在基面的投影与进给运动方向之间的夹角称为() A.后角 B.主

题型:单项选择题

问题:

在基面中测量的主切削刃在基面的投影与进给运动方向之间的夹角称为()

A.后角

B.主偏角

C.前角

D.副偏角

考点:建设工程经济建设工程经济题库
题型:单项选择题

试验结果表明,砂类土的内摩擦角随试样干密度的增加而______。

A.减小
B.增大
C.不变
D.不定

题型:单项选择题

基础工程设计的基本原则和目的?

题型:单项选择题

1995年国家发布《确定土地所有权和使用权的若干规定》后,某县为了确定土地所有权和使用权,对一块土地进行权属确定,该块土地系土地改革时政府分给农民张某并颁发了土地所有证的土地。该块土地应确定属于()。

A.张某所有

B.国家所有

C.农民集体所有

D.张某和集体共有

题型:单项选择题

有A、B、C、D、E五种物质,在常温下A、B、C是气体;其中C和D内含同一种元素;B和E内含有同一种元素,D是黑色固体,E是液体;其中C和D内含同一种元素;B和E内含有同一种元素,A、C、E内含有同一种元素.五种物质间的转变关系如下:

①E

通电
A+B    ②A+D
点燃
C

根据以上回答问题:

(1)写出A、C的名称:A______,C______;

(2)C和D内含有的同种元素的符号是______;A、C、E含有的同种元素的符号是______.

(3)写出上述两个反应的化学方程式______.

题型:单项选择题

Since long ago,greeting cards have been considered a time-saver.More than 150 years ago,a busy Englishman,Sir Henry,asked a friend to design a card so that he didn't have to labour to write holiday letters to his friends at the end of the year.Those paper cards are now the tradition.

But time,like sunlight,is still in short supply for December.That's why the Internet is ready to make a change in holiday greeting customs.Already,those,who are always busy,like sending video greetings by e-mail.So,don't be surprised to find a lively card in your electronic mail box at the end of the year or at any time you should have one.

A recent survey by the Shared Greetings Company found 50 percent of all the Internet users will send online cards especially during the holiday seasons.“That is a lot easier,and it is lively,”said Carol,a New Yorker,who had stopped at the Shared Greetings Company demonstration() online.With her children's help,she sent her first e-card before Thanksgiving Day.“It was the first time I had done something like this;it's quite enjoyable,”she said.

“I will send online Christmas cards to my friends,”said Marcos,a 22-year-old student.“It costs so little and you can even send numbers of greetings at a time.”But he added “the e-card also has its limits,and I don't think it is ready to replace the paper card for the more formal or traditional occasions.For some people,I would rather buy paper cards and mail them traditionally.I believe it is more personal and respectful in that way,”he said.

Well,for those who are very busy but still prefer to do a lot of greetings to different receivers in the holiday season,the Internet may have another way.“Now you can use the Net to decide and send as many as 50 beautiful cards,which allows the buyer to choose the inside saying,as well as the ink colour and typeface,only costing about 30 minutes,”said Julie,vice-president of marketing for an electronic card company-Hallmark Company.“And if you are in less of a hurry,you can spend another 30 minutes sitting in your home or office to create a photo card,showing off your kids,your pets or even your new house-anything as your favorite design for your relatives and friends.”

小题1:How can we understand “But time,like sunlight,is still in short supply for December”in Paragraph 2?

A.December cannot supply enough time for people because the sunlight in this month is short.

B.People are always busy at the end of the year,so time is precious like the sunlight in winter.

C.Time is short at the end of the year,like the sunlight in December.

D.Time passes quickly like the sunlight in winter as December comes.小题2:According to the 22-year-old student,he would probably mail e-cards to everyone except_________.

A.the members of his family

B.his girlfriend

C.the teachers who have taught him

D.his schoolmates小题3:If you are quite busy,but having many greetings to send,which of the following is your best choice?

A.Ordering a lot of cards you like online and sending them from the post office.

B.Getting as many cards from your electronic mail box and mailing them on the Net.

C.Sitting and writing lots of beautiful cards at home and sending them just in a traditional way.

D.Choosing personalized cards in numbers and mailing them directly on the Net.

更多题库