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【单选题】
与带传动相比,链传动的优点是A.
工作平稳,无噪声
B.
寿命长
C.
制造费用低
D.
能保持准确的瞬时传动比
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【单选题】采用间歇反应釜来生产乙酸乙酯,反应方程式如下:a+b→c+d。a,b,c,d分别代表了乙醇,乙酸,乙酸乙酯和水,反应等温等容进行,其为可逆反应。反应速率方程为:-r=k(Ca*Cb-Cc*Cd/Kc)。其中k为2.2*10^-6m3/(kmol.s),Kc为2.93。反应初始溶液的组成为,乙醇3.91 kmol/m3;乙酸10.2 kmol/m3;乙酸乙酯为0;水17.56 kmol/m3,乙酸乙...
A.
330.9678
B.
313.6683
C.
348.2672
D.
192.5725
E.
296.3689
F.
279.0695
【单选题】采用间歇反应釜来生产乙酸乙酯,反应方程式如下:a+b→c+d。a,b,c,d分别代表了乙醇,乙酸,乙酸乙酯和水,反应等温等容进行,其为可逆反应。反应速率方程为:-r=k(Ca*Cb-Cc*Cd/Kc)。其中k为2.2*10^-6m3/(kmol.s),Kc为2.93。反应初始溶液的组成为,乙醇3.91 kmol/m3;乙酸10.2 kmol/m3;乙酸乙酯为0;水17.56 kmol/m3,乙酸乙...
A.
192.5725
B.
348.2672
C.
209.8719
D.
227.1713
E.
330.9678
F.
313.6683
【单选题】Most drinks stating that they are fruit flavored (水果味道的) contain no fruit at all, while most of the rest contain only a small quantity of fruit, according to a study carried by the British Food Commi...
A.
The products which contain real fruit are popular with people.
B.
Even products advertised as more natural often contained no fruit.
C.
They found that about 60 percent of them didn't contain any fruit at all.
D.
If companies can cut their costs by using flavoring, they are likely to do so. E. It is important and necessary to demand a small amount of flavoring in the products. F. Actually the product contains just a tiny percentage of strawberry or even no fruit at all. G. The Food Commission suggested all flavors used in a product should be listed on the packaging.
【简答题】李白诗中的名言名句填空 君不见黄河之水天上来,_________________。
【简答题】“君不见黄河之水天上来，奔流到海不复回。”这是唐代诗人李白的著名诗句。从生物圈水循环的角度，你认为这两句诗是否符合科学道理？请说明理由。
【简答题】单词拼写（共10小题，满分5分） 小题1:He stared at the picture with _____________(好奇心). 小题2:Reading more books is of great _____________(益处)to children. 小题3:They are ____________(寻找)for solutions to the problems. 小题4...
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