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【简答题】
判断如下三段论是否正确,如果错误,请指出错在哪里? 石头不是闪光的;沙子不是金属;所以,所有石头都不是沙子。 该三段论推理( )。 原因是在这个三段论中,大前提和小前提都是否定命题,以两个( )为前提,无法得出有效结论。
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【单选题】She told me that she has already gone to the United States four times before she attended that conference.
A.
had already been
B.
has already been
C.
already went
D.
was already going
【简答题】在对流温度差大小相同的条件下，在夏季和冬季，屋顶天花板内表面的对流放热系数是否相同？为什么？
【简答题】在对流温度差大小相同的条件下，在夏季和冬季，屋顶天花板内表面的对流换热系数是否相同?为什么?
【简答题】A．No, because she's already spent most of it. B．No, because she has already lent it to a friend. C．Yes, because she got some while she was shopping. D．Yes, because she wants to help him.
【单选题】---Does Miss Ye like playing __________tennis? ---No, she doesn’t, but she likes playing ________ piano.
A.
the; the
B.
/; the
C.
the; /
D.
a; a
【简答题】在对流温度差大小相同的条件下,在夏季和冬季,屋顶天花板内表面的自然对流换热表面传热系数是否相同?为什么?
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