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【判断题】
DCS是集散控制系统A.
正确
B.
错误
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皮皮学刷刷变学霸
举一反三
【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?
【单选题】She is already 16 years old. But she _______as if she were still a little girl.
A.
believes
B.
absorbs
C.
accrues
D.
behaves
【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.
【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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