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问题 计算题

现有C2H6，C3H6，C4H6的混合气体，充分燃烧时，消耗氧气的体积为混合气体原体积的5倍（在同温同压下），求混合气体符合此要求的可能的物质的量配比共有几种情况？（配比写成最简单的整数比，而且每个整数都大于0，小于8）

答案

3x+y=z 当x=l，x-y=3；

 当x=2时，6=x-y；y=l，z=7；综上所述，有5种情况。

邓 * * 被称为是中国社会主义现代化建设的总设计师。主要是因为：

A．提出了社会主义初级阶段理论

B．提出了“一国两制”的伟大构想

C．提出了社会主义市场经济概念

D．解决了中国如何建设社会主义的问题
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Questions


·Read the following passage and choose the best word for each space.
Do you want to send an e-mail message to the White House
Good luck.
In the past, (26) President Bush — or at least those assigned to read his mail — what was (27) your mind it was necessary only to sit down at a personal computer connected to the lnternet and (28) a note to president@ whitehouse.gov.
But this week, Tom Matzzie, an online organizer with the A.F.L.-C.I.O., discovered that (29) with the White House had become a bit more (30) . When Mr. Matzzie sent an e-mail protesting (31) a Bush administration policy, the message was bounced back With an automated reply, saying he had to send it again in a new way.
Under a system (32) on the White House Website (33) the first time last week, those who want to send a message to President Bush must now (34) as many as nine Web pages and (35) a detailed form that starts by asking whether the message sender supports White House policy (36) differs with it.
The white House says the new e-mail system is an effort to be more responsive (37) the public and offer the administration "real time" access (38) citizen comments.
Completing a message to the president also requires (39) a subject from the provided list, then entering a full name, organization, address and e-mail address. (40) the message is sent, the writer must wait for an automated response (41) his message, (42) whether the addressee intended to send the message. The message is delivered to the White House only after the person using that e-mail address (43) it.
"Over (44) , it’s a very cumbersome process," said Jakob Nielsen, an authority on Web design. "It’s probably designed deliberately to (45) on their e-mail.\

A. As B. When C. While D. Once
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