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【单选题】
稳定传热过程,通过三层厚度相同的不同材料,每层间温度变化如图所示,则、 λ1、λ2、λ3的大小顺序____________,A.
λ 3 〉λ 2 〉λ 1
B.
λ 1 〉λ 2 〉λ 3
C.
λ 3 〉λ 1 〉λ 2
D.
λ 2 〉λ 3 〉λ 1
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【单选题】I ______ to help you to do homework but I couldn’t spare any time. I ______ a composition last night and I’ll finish it tomorrow.
A.
wanted; wrote
B.
had wanted; was writing
C.
have wanted; wrote
D.
wanted; have been writing
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