The source code for the tree controls shown in Figure 3 appears in Listing 4.
图3所示树控件的源代码见清单4。
A valve located on the Christmas tree that controls all flow from the wellbore.
位于采油树上的用于控制自来井筒的全部流量的阀门。
A valve located on the Christmas tree that controls all flow from the wellbore.
位于采油树上的用于控制自来井筒的全部流量的阀门。
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