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当前学科：红十字知识竞赛
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为什么要建立中国造血干细胞捐献者资料库？
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已知，在一条道路的四车道变成三车道的瓶颈处，一天内的车辆到达曲线为480t-80t2，如下图所示，经测量得知每辆车离开所需时间为15s，求最大排队长度和总延误时间。
革兰阳性和阴性细菌细胞壁的特有成分是（）
Good Table Manners Manners play an important part in making a favorable impression at the dinner table. Here are some general rules： Napkin （餐巾） use The meal begins when the host unfolds his or her napkin. This is your signal to do the same， so place your napkin on your lap. Unfold it completely if it is a small napkin. Or in half， lengthwise （纵向地） ，if it is a large dinner napkin. If you need to leave the table during the meal， place your napkin on your chair as a signal to your server that you will be returning. Once the meal is over， place your napkin neatly on the table to the right of your dinner plate. Do not refold it. Use a napkin only for your mouth. Never use it for your nose， face or forehead. Use of utensils （餐具） Start with the knife， fork or spoon furthest from your plate， and work your way in， using one utensil for each course. If soup is served， remember to spoon away from yourself. This helps stop the drips. Do not put the entire soup spoon in your mouth. Instead， fill a soup spoon about 75 per cent with soup， and sip（啜饮）it from the side noiselessly. After finishing dinner， place the knife and fork parallel to one another across the plate with the knife blade facing inward toward the plate. Using your fingers Here's a list of finger foods： sandwiches， cookies， small fruits or berries with stems， French fries and potato chips， and hamburgers. Chew（咀嚼）with your mouth closed and don't make noise； don't talk with your mouth full. Bread must be broken with your hands. It is never cut with a knife. Don't pick something Out of your teeth. Instead， excuse yourself to the bathroom. If possible， try not to cough at the table. Do not put your elbows （肘） on the table. In France， it is essential to have both hands above the table at the same time. Do not put bones or anything else on the table. Things that are not eaten should be put on your plate. The napkin is used only for（）.
在开停车过程中要各压力应：（）>氧气压力>转化系统压力
用于建筑内部装修的高分子合成材料可分为（）。
周围神经损伤后，为观察神经的修复情况，可进行下列哪几项检查（）
钻石荧光强度分级是在（）紫外光下，对此标准荧光强度样石作出登记划分
浸膏剂的浓度是（）
中暑的治疗（）
计算机由哪几部分组成，其中哪些部分组成了中央处理器？