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【单选题】
“流化” 指的是“流态化”,颗粒类似于流体的一种运行状态。据此可以判断,流化床没有【 】的特点:A.
无论床层如何倾斜，床层表面总保持水平；
B.
床内固体颗粒可从底部或侧面的排出；
C.
像水一样，流化床也存在沸点；
D.
密度大的物体在床内会下沉，密度小的物体会上浮。
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