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水泥混凝土配合比设计时，实际单位用水量最终是在（）阶段确定的。
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主要发生于夏季，患畜突然发病死亡，天然孔出血，血液凝固不良，呈煤焦油样，皮下结缔组织下出血性胶样浸润，脾脏肿大、呈淤泥样。该病可能是（）
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搞好管道水工保护工程的修建和维护，是管道管理工作的重要任务。
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按研究范围不同，统计指数可分为（）
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用活性炭管作为固体吸附剂采集工作场所的空气中有毒物质，如用溶剂解吸时，最常用的有机溶剂是（）
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Dinner,for English people,is the richest meal of the day and is a very formal meal.Many people even wear special clothes for dinner,so if you are asked out to dinner you must find out whether you are expected to wear a dinner suit,for you would feel very upset if,when you get there,you were the only person in ordinary clothes.Dinner is generally served at about half past seven.All the members of the family sit down together and eat on their best behavior.The head of the family sits at one end of the table,his wife sits at the other end.If there is a guest,he generally sits in the place of honor,which is at the fight of the lady of the house.If there are several guests,the most important is asked to sit there.When the meal conversation is carried on,you should try to get in conversation with the person on your right or left,but you should not try to talk to someone who is a long way from you.
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“2N”表示的化学意义正确的是（）
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女，28岁。主诉：半年来全口牙龈逐渐肿大，刷牙出血。如诊断为妊娠期龈炎，临床检查最有可能的发现是（）。
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NAVAREA将全球划分为（）个航行警告区。
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在抢救甲状腺功能亢进危象时应首选下列哪种药物（）