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分光光度计测量吸光度的元件是:()
患者李某,男,7岁,因上呼吸道感染收住某医院儿科病房。当时高热39℃,咳嗽,经抗生素滴注后体温下降,第4天体温已正常,咳嗽减轻,情况好转。该医院因在搞一项关于儿童电生理无伤性检查方面的研究课题,故经患儿同意后,把患儿作为受试者。次日父母探视时发现孩子的头顶部皮肤有了个直径2mm的圆形丘疹红斑,当了解情况后,即与医生发生了争执。关于争执,下列说法最正确的是()
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Ⅰ级铁路困难地段,内燃机车牵引时,最大限制坡度为12‰。
对抗新产生的血栓应首选( )
列车在坡道上长时间停留时,必须施加(),防止列车溜逸。
对心力衰竭患者进行择期手术,至少待心衰控制以后()。
离子选择电极-流动注射法测定水中氧化物时,电极在使用前必须先活化。活化方法为:在10-3mol/L()溶液中浸泡()h以上。
世界上第一个载人航天器是()发射成功的,是由()国家发射的。
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