什么是热力系统的压力容器?除此之外还有哪些压力容器?

题型:问答题 简答题

问题:

什么是热力系统的压力容器?除此之外还有哪些压力容器?

考点:锅炉操作工考试锅炉鉴定理论知识锅炉鉴定理论知识题库
题型:问答题 简答题

使用打制石器,并已懂得人工取火的远古人类是:( )

题型:问答题 简答题

女性,46岁。有隆乳史,无意中发现左乳包块。查体:左乳外上象限可扪及一2cm×3cm包块,质硬,边界欠清,尚可推动。超声检查:肿块形态不规则,边缘呈分叶状,未见明显包膜。彩色多普勒超声显示肿块内血流分布杂乱,可探及高阻力动脉血流信号。

乳腺良性与恶性肿瘤的超声检查鉴别要点是()。

A.边界是否光滑、完整

B.内部是否有钙化灶

C.后方是否有回声衰减

D.肿块纵径与横径比值>1,支持恶性肿瘤诊断

E.以上都是

题型:问答题 简答题

Nowhere else in the world ______ a good person like Mr Smith. [ ]

A.  can we find    

B.  we can find    

C. we will find      

D. we have found

题型:问答题 简答题

境内机构的经常项目外汇收入,无论金额大小,结汇方式如何,均可直接到外汇指定银行办理结汇或入账手续。

题型:问答题 简答题

"Sesame Street" has been called "the longest street in the world". That is because the television program by that name can now be seen in so many parts of the world. That program became one of American’s exports soon after it went on the air in New York in 1969.
In the United States more than six million children watch the program regularly. The viewers include more than half the nation’s pre-school children, from every kind of economic, racial, and geographical group.
Although some educators object to certain elements in the program, parents praise it highly. Many teachers also consider it a great help, though some teachers find that problems arise when first graders who have learned from "Sesame Street" are in the same class with children who have not watched the program.
Tests have shown that children from all racial, geographical, and economic backgrounds have benefited from watching it. Those who watch it five times a week learn more than occasional viewers. In the US the program is shown at different hours during the week in order to increase the number of children who can watch it regularly.
The programs all use songs, stories, jokes, and pictures to give children a basic understanding of numbers, letters and human relationships. But there are some differences. For example, the Spanish program, produced in Mexico City, devotes more time to teaching whole words than to teaching separate letters.
Why has "Sesame Street" been so much more successful than other children’s shows Many reasons have been suggested. People mention the educational theories of its creators, the support by the government and private businesses, and the skillful use of a variety of TV tricks. Perhaps an equally important reason is that mothers watch it along with their children. This is partly because famous adult stars often appear on it. But the best reason for the success of the program may be that it makes every child watching feel able to learn. The child finds himself learning, and he wants to learn more.

"Sesame Street" is actually ______.

A. a street in the US

B. a program for children
C. a program for teachers

D. a program for students

更多题库