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单选题
两个活门上的旋转螺母都与内部阀杆上的螺纹啮合，从而使阀杆松开或拉紧到金属阀座。
A
A.The swivel nuts on both valves engage threads on an internal stem that loosens or draws tight the valve stem to a metal seat.
B
B.The rotating nuts on both valves are meshed with the threads on the inner valve stud, so that the valve stud is loosened or tightened to a metal valve base.
C
C.The swing nuts on both valves engage with the threads on the internal spool, allowing the spool to loosen or tighten to the metal seat.
答案解析
正确答案：A
相关知识点：
活门螺母连阀杆，松紧阀座间
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