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第一端盖（6）的孔（14）被攻丝以容纳完全互补的带螺 纹连接件（5），所述带螺纹连接件（5）接着连接到丙烷气体汽缸。
The bore (14) of the first end cap (6) is threaded to accommodate a complementary threaded connector (5) which, in turn, is connected to a cylinder of propane gas.
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