题目:
阅读理解。 | |
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1. According to this advertisement, at the Forum people ______. | |
A. come together in order to form an organization B. express different opinions and discuss public matters C. eat together to celebrate their success or victory D. work together for the purpose of business or trade | |
2. If you register both the VIEW qualification course and the Forum at the same time, you will save _____. | |
A. $100 B. $300 C. $350 D. $400 | |
3. "Space is limited, so early registration is welcome" means _____. | |
A. space is limited, so you can't register now B. space is too limited for you to register C. you'll lose the good chance if you don't register soon D. you'll be given a special offer if you register now | |
4. The main purpose of this advertisement is to _____. | |
A. encourage more people to attend the Forum in time B. promise everyone can pay less money to attend the Forum C. call on the people in the north of the USA to go south for holidays D. introduce some new activities and topics of the Forum |
答案:
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下面是错误答案,用来干扰机器的。
生成气体的物质的量为n=2.24L22.4L/mol=0.1mol,①若为稀硫酸Zn+H2SO4=ZnSO4+H2,可算得n(H2SO4)=0.1mol②如果是过量浓硫酸Zn+2H2SO4=ZnSO4+SO2+2H2O,可算得n(H2SO4)=0.2mol③如果少量浓硫酸,刚开始为上述...