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A packing assembly 9 is arranged between the valve stem 3 and the valve cover 2, the 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. The arcuate end face 12 forms a line seal between the sealing surface of the valve body 1 and the valve seat 7. The water grain 41 can ensure the sealing performance of the valve seat 7 and the valve disc 4.Http://www.freebuf.com/news/67204.htmlMDT meeting discusses at least what clinical information is needed;昭和初期、落語の世界に入った八雲は、同期入門の落語の天才・助六と、固い友情で結ばれる。八雲は助六の芸に憧れ、嫉妬し、追いつこうともがき、芸者・みよ吉にも支えられ、成長していく。やがて、助六とみよ吉とが結ばれるが、ふたりは謎に満ちた事故死を遂げてしまう。八雲はその死を巡る秘密を抱いたまま、ふたりの遺児・小夏を引き取る。小夏は、八雲を「親の仇」と恨んで成長し、やがて天衣無縫な八雲の弟子・与太郎とともに、八雲がひた隠す「助六とみよ吉の死の真相」に迫っていく…。他们发觉自己真的长见识了，原来现实世界中，还有堪比武侠小说里情节的事。时空