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【单选题】
影响膜状换热系数的主要因素是（）。A.
蒸汽流速
B.
不凝结气体
C.
表面粗糙度
D.
D.+B
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皮皮学刷刷变学霸
举一反三
【简答题】adj. unhappy or not satisfied with the situation you are in
【简答题】waist
【单选题】Which statement is TRUE?
A.
The average waist size for a man is 36-38 in.
B.
The average waist size for a woman is 30 in.
C.
In the mid-Eighties, more than half million under-16s in the UK are classed as overweight.
D.
The obesity pandemic has now spread to South America.