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[问答题,简答题] 连铸坯中心偏析是如何的产生?

孔源性视网膜脱离手术成功的关键是() ["放出视网膜下液","巩膜外加压","玻璃体腔填充","松解玻璃体牵引","封闭视网膜裂孔"] 抗癫痫药物治疗的原则是() ["大量,突击,静脉用药","按痫性发作的类型选择药物,短期用药,随时改变品种","按痫性发作的类型选择药物,长期规则用药","长期规则用药,禁酒","大剂量,短期,联合用药"] 肾功能不良的患者禁用() ["青霉素G","耐酶青霉素类","广谱青霉素","第一代头孢菌素","第三代头孢菌素"] 可治疗伤寒的青霉素类药是() ["苄青霉素","苯唑西林","羧苄西林","替卡西林","氨苄西林"] 可以增加房水排出量的青光眼手术方式为() ["周边虹膜切除术","小梁切除术","激光周边虹膜切开术","睫状体冷凝术","睫状体光凝术"] 连铸坯中心偏析是如何的产生?
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