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2. Dynamically add functions to an object and undo them dynamically. (Inheritance cannot do this. The function of inheritance is static and cannot be added or deleted dynamically.)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, Between that disc 4 and the guide sleeve 6 is provide a valve seat 7, A packing assembly 9 is arranged between the valve stem 3 and the valve cover 2, the O-ring 10 is further arranged at 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 which 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 packing assembly 9 comprises a flexible graphite packing layer.　　一次交通意外，让王惜月（王智 饰）陷入了一场从未预想的“一见钟情”；同为职场精英的何娜（克拉拉 饰），一贯洒脱对待爱情的心态也面临着动摇。这个原本对她们来说只是生存战场的城市，突然变得更为复杂了……谎言之上的爱情岌岌可危，朋友名义下的快乐转瞬即逝，两段需要抉择的“深爱”，她们的答案，是否会和你一样？Birthday date is a holiday, such as Labor Day (0501), Children's Day (0601), National Day (1001) and other holiday dates, the price will also be increased accordingly.　　▪ 弟弟患病带给姐姐人生课题的_家庭不只是如此，项羽还派人返回彭城，要求立即尽快离开，前往那为他义帝身份量身打造的梆、州。