为什么真空下脱氮比脱氢困难?

题型:问答题 简答题

问题:

为什么真空下脱氮比脱氢困难?

考点:炉外精炼工初级炉外精炼工初级炉外精炼工题库
题型:问答题 简答题

采用概算指标法编制建筑工程概算时,当设计对象的结构特征与某个概算指标有局部差异时,则()概算指标编制概算。

A.直接套用

B.不能用

C.修正后套用

D.重新编制

题型:问答题 简答题

—Where ______ the lion come from?

—_______.[ ]

A.is; America

B.does; American

C.does; America

题型:问答题 简答题
6
7
小,比
5
9
大,而且大小相差一个分数单位的分数是______.
题型:问答题 简答题

Short Story Contest : Win $8,000
First Prize $5,000 in Cash
Writers Creative Writing Correspondence Program offers non-professional authors an opportunity to have a novel, book of short stories, volume of poetry, or a work of creative non-fiction, critiqued(评论) by professors and professionals.
Second Prize $2,000 / Third Prize $1,000
Short Story Contest Rules
·The contest begins at 9 am Friday, November 29, 2008 and ends at 4 pm Thursday, January 17,2009.
·The contest is open to all residents of Ontario who are at 16 or over, except for employees, judges, and anyone living with any employee of the sponsors or judges.
·The author’s name, address, phone number, and a 25-50-word self-introduction must be included with each entry on a separate sheet of paper. The name of the author should not appear in the story itself.
· Stories must be original and unpublished up to the time the winners are declared on June 23, 2009.
·Stories must be written on a computer or typewriter, be double-spaced and no longer than 2,500 words. Total word count should be printed on the front page of the story.
· No changes to a story are allowed once the Star receives your entry. Manuscripts will not be returned.
· A $5 entry fee must accompany each entry. Cheques or money orders should be made out to the Sunday Star Short Story Contest. Please do not send coins.
·Winners will be informed by telephone between 9 am and 5 pm on June 23, 2009.
·Professors from the writing Centre at Ryerson University will complete the first round of judging. Another group of professional writers will select the final three.
SEND YOUR STORY TO:
SHORT STORY CONTEST, THE SUNDAY STAR ONE YONGE STREET, TORONTO, Ontario M5E1E6
Full contest rules are available at www.the star.com / contests Tel: 416 – 367 – 2000
56. Which of the following is allowed to be written on the front page of the story?
A. The total word count.                 B. The author’s name.
C. The author’s self-introduction.          D. The author’s phone number.
57. From the above advertisement, we can find out ______.
A. the topic of the stories
B. the number of winners
C. the money the sponsors give to the organizer
D. the total number of contestants
58. It can be learned from the passage that ______.
A. Winners will get a book of short stories besides the money
B. Citizens over 16 living in Ontario can compete in the contest
C. Contestants should send printed stories to the organizer
D. Professors from universities will decide the winners        
题型:问答题 简答题

二恶英是一种持久性有机污染物,目前对二恶英的治理存在各方面的难题。首先,对二恶英的监测技术要求很高,采样要求很严格,需要特殊的高灵敏检测仪器。其次,二恶英类化合物分布广泛、污染源多。垃圾焚烧是二恶英的一个重要来源,美、日、德都有比较先进的技术来处理,如活性炭吸附、催化剂处理等,但中国目前还很少采用这些办法。作为一个发展中国家来说,污染物处理的技术和成本都是需要考虑的问题。
根据这段话,理解正确的是( )。

A.技术和成本是制约我国治理二恶英污染的主要因素
B.我国目前还不具备从环境中检测出二恶英的技术水平
C.增加经费投入能够解决目前的问题
D.由于分布广泛,根除二恶英污染是不可能的

更多题库