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【单选题】
某反应 A → Y ,其速率系数 k A =6.93 min -1 ,则该反应物 A 的浓度从 1.0 mol∙dm -3 变到 0.5 mol∙dm -3 所需时间是( )A.
0.2 min
B.
0.1 min
C.
1 min
D.
0.5 min
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举一反三
【判断题】A traditional British Christmas dinner usually includes roast turkey, roast potatoes and a large choice of vegetables.
A.
正确
B.
错误
【单选题】It is difficult to make a decision because the choice is _______ large.
A.
so
B.
such
C.
such a
D.
such an
【判断题】A traditional British Christmas dinner usually includes roast turkey, roast potatoes and a large choice of vegetables.
A.
正确
B.
错误
【单选题】What does the writer say about entrepreneurs in the first paragraph?
A.
It is wrong to assume that they are different from other managers.
B.
The problems they have to cope with are specific to small businesses.
C.
They find it difficult to attract staff with sufficient expertise.
D.
They could learn from the organisational skills of managers in large companies.
【简答题】investors who now have such a large choice of things to invest in (6 letters) __________________.
【简答题】侦查、 侦察 1. 我军先放了两炮进行火力( )。 2.公安人员经50多天的( ),终于掌握了嫌疑犯张某的作案证据。
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