Street vendors suddenly pop up in the downtown area, selling everything explosive, from big doublestrings of red, cigarette-sized firecrackers to meter-long bottle rockets.
Pig lift method with U-shape doublestrings is easy to be limited by size of casing and very complicated in construction operation process. Thus, the large restrictions exist in the field application.
球塞气举方式采用U型双管柱易受套管尺寸限制,且施工作业较为复杂,其应用受到较大限制。
3
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