A. 自由活塞式→水压固定活塞式→束节式→厚壁敞口式
B. 厚壁敞口式→束节式→自由活塞式→水压固定活塞式
C. 束节式→厚壁敞口式→水压固定活塞式→自由活塞式
D. 水压固定活塞式→自由活塞式→束节式→厚壁敞口式
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