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在20℃左右的水中解冻比在25℃左右的空气中解冻速度要快。
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什么是质量成本？质量成本包括哪些内容？成本控制有哪些特点？
生产经营单位发生生产安全事故后，事故现场有关人员应当立即报告本*单位负责人。单位负责人接到事故报告后，应当迅速采取有效措施，组织抢救，防止事故扩大，减少人员伤亡和财产损失，并按照国家有关规定立即如实报告当地负有安全生产监督管理职责的部门，不得隐瞒不报、谎报或者迟报，不得故意破坏事故现场、毁灭有关证据。
在整体性良好，裂隙节理不发育的坚硬岩石中开挖洞室，开挖结束后，围岩的弹性变形就完成。若在此后进行支护，支护上没有山岩压力。这种支护主要是用来（）。
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. Where is the napkin normally placed during the meal？（）
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