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10. Visitor pattern杨长帆赶紧领着翘儿作揖问好。A low temperature stop valve, Unlike Example 1, Comprises a valve body 1 and a valve cover 2, A valve stem 3 is arrange in that valve body 1, One end of the valve stem 3 is provided with a valve disc 4, The other end of the valve stem 3 is provided with an adjusting handwheel 5, A low portion of that disc 4 is provided with a guide sleeve 6, The guide sleeve 6 is fixed by means of a connecting piece and a spring pad 8, A valve seat 7 is arranged between the valve disc 4 and the guide sleeve 6, a packing assembly 9 is arranged between the valve stem 3 and the valve cover 2, an O-ring 10 is further arranged on the upper part of the packing assembly 9, the upper part of the O-ring 10 is provided with a packing gland 11, the valve body 1 is provided with an arc-shaped end face 12, the arc-shaped end face 12 forms a line seal between the valve body 1 and the valve seat 7, and the contact end of the valve disc 4 and the valve seat 7 is provided with a water grain surface 41.Java is a typical object-oriented programming language, so this tutorial is based on Java to explain these 23 design patterns. If you don't know Java, please hit the "Java Tutorial" to learn.第二天，他们将行囊都留在山洞里，把洞口封好，只带了少量干粮上路，循着来时的路往回走。讲述医学生Mia，发现在她所在的大学城使用了高度先进的生物黑客技术。当这一突破性的发现落入坏人手中时，她必须决定她站在哪一边，以及她愿意走多远才能找到真相。谢谢，有你们真好。