行政行为的撤销是行政实务中的普遍现象，也是行政法学研究的重要内容。

The cancellation of administrative act is a widespread phenomenon in administrative practice as well as the important contents of the study of administrative law science.

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再则从作成的行政行为观察，违反何种程序将导致行政行为无效、得撤销或根本不生效力。

Thirdly, an administrative act can be withdrawn or is of no force when it violates what kind of procedure.

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最后，分析假象行政行为、可撤销行政行为与无效行政行为的关系。

Last, the relations are analyzed between false administrative behavior, cancelable administrative behavior and invalid administrative behavior.

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