汽化冷却烟道用无缝钢管围成筒形结构，钢管的排列方式有水管式、

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问题填空题

汽化冷却烟道用无缝钢管围成筒形结构，钢管的排列方式有水管式、隔板管式和（）式

答案

参考答案：密排管

选择题

. A look at recent trends in world fisheries reveals ________ the ocean on a global scale.

A．how we have swiftly affected

B．that how swiftly we have affected

C．how swiftly we have affected

D．however swiftly we have affected

问答题简答题

简述树种生物学特性、生态学特性和林学特性的区别。