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热质交换设备按照工作原理分为几类，他们各自的特点是什么？

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锤式碎煤机的破碎过程是一部分煤块（)旋转的锤头的离心作用下被击碎另一部分煤块在锤头产生（)作用下被打到破碎板上被击碎，最后挤压出筛板。

电力系统中各种电器设备的接地分以下三种：（1)（)（2)（)（3)防雷接地。

But with the clear conception which only a ten－year－old boy can have, I still understood that the compromise included eating that oyster, sitting on the side of my father's plate.

"Now, stop complaining, try one oyster for me, then you can have something nice and easy to eat, maybe some prawns with bread and butter," he suggested, striking a note of compromise for the first time during the whole meal.