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【单选题】
2SO 2 +O 2 ?2SO 3 是工业上制造硫酸重要反应之一．下列关于该反应的说法正确的是（ ）A.
增加O 2 的浓度能加快反应速率
B.
降低体系温度能加快反应速率
C.
使用催化剂不影响反应速率
D.
若反应在密闭容器中进行，2molSO 2 和1molO 2 能够生成2molSO 3
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举一反三
【判断题】In the following pair of sentences, sentence a is more formal.a. The supermarket can provide a lot of things for people to choose from.b. There is a wide variety of options/ alternatives for customer ...
A.
正确
B.
错误
【判断题】There is a formal toast that the host offers at the beginning of the meal to welcome his guests. The other is more informal and comes near the end of the meal, usually during dessert. Champagne will b...
A.
正确
B.
错误
【单选题】Thereis no need to make a formal appointment to use an area in the “student street”for a meeting.
A.
True
B.
False
C.
Impossible to know from the article
【简答题】用矩形轮廓的图形逻辑符号改画图P2.16中的4个电路。
【判断题】There is a formal toast that the host offers at the beginning of the meal to welcome his guests. The other is more informal and comes near the end of the meal, usually during dessert. Champagne will b...
A.
正确
B.
错误
【单选题】有些旋转体和偏心重量是分布在几个不同的回转平面内,即使其旋转重心在其旋转轴上,旋转时各不同回转平面内偏心重量产生的离心惯性力偶仍然是不平衡的,我们把这样的不平衡旋转体称为( )的旋转体。
A.
多回转面不平衡
B.
静不平衡
C.
动不平衡
D.
偶力不平衡
【判断题】There is a formal toast that the host offers at the beginning of the meal to welcome his guests. The other is more informal and comes near the end of the meal, usually during dessert. Champagne will b...
A.
正确
B.
错误
【简答题】用矩形轮廓的图形逻辑符号改画图P2.15中的4个电路。
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