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问题描述：

[多选] 下列可减少四环素吸收的离子是（）
A．Al+ B．Fe2+ C．Na+ D．K+ E．Ca2+
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随机题目

一个2周大的男孩被父母带到急诊室。 他一生的前几周已经脱水，并且经常呕吐。 父母说，婴儿每次喂奶后都会呕吐，但他总是很饿。 呕吐与进食一致，且颜色不佳。 经检查，婴儿无发热，前font凹陷。 心脏和肺部检查未发现异常。 腹部检查显示可见的蠕动性胃蠕动波，在肝边缘下方上中隔的脐带上方和右侧，有一个2cm坚硬的活动块。 凳子是愈创木脂阴性的。 实验室研究与这种情况的典型发现是一致的。 放置鼻胃管和静脉内管线。 以下哪项是管理中最合适的下一步？A 2-week-old boy is brought to the emergency department by his parents． He has become dehydrated during his first few weeks of life and is vomiting frequently． The parents state that the infant vomits after each feeding but he is always hungry． The emesis is consistent with feedings and nonbilious in Color． On examination， the infant is afebrile and the anterior fontanelle is sunken． Heart and lung examinations reveal no abnormalities． Abdominal examination shows visible gastric peristaltic waves and a 2cm firm， mobile mass above and to the right of the umbilicus in the mid-epigastrium beneath the liver edge． Stool is guaiac-negative． Laboratory studies are consistent with the typical findings of this condition． A nasogastric tube and intravenous line are placed． Which of the following is the most appropriate next step in management？
怀孕33周的一名23岁孕妇gravida 2第1段就医 因为呼吸急促 到目前为止，妊娠一直很简单。 她 开始注意到人们需要大约20周的呼吸时间， 自那时以来一直保持这种状态，最近的情况只是稍有恶化。 她没有胸痛，恶心， 呕吐，发汗或相关症状，并且具有正常的运动耐力。 她有 没有医疗问题，也从未做过手术。 她过去的产科史对 足月分娩2年前。 她的血压是100/60毫米汞柱，脉搏是80 /分钟， 温度为37．0 C（98．6 F），呼吸为16 / min。 她的身体检查是 完全在正常范围内。 胸部X线检查也正常。 实验室研究，包括 动脉血气，显示：A 23-year-old woman， gravida 2， para 1， at 33 weeks" gestation comes to the physician because of shortness of breath． The pregnancy has been uncomplicated up to this point． She started noticing the awareness of the need to breathe at about 20 weeks and this has remained since that time with only a slight recent worsening． She has no chest pain， nausea， vomiting， diaphoresis， or associated symptoms， and has normal exercise tolerance． She has no medical problems and has never had surgery． Her past obstetric history is significant for a term vaginal delivery 2 years ago． Her blood pressure is 100/60 mm Hg， pulse is 80/min， temperature is 37．0 C （98．6 F）， and respirations are 16/min． Her physical examination is entirely within normal limits． Chest x-ray is also normal． Laboratory studies， including an arterial blood gas， show: pH: 7．45 PCO2: 28 mm Hg PO2: 96 mm Hg Sodium: 135 mEq/L Potassium: 4．0 mEq/L Chloride: 105 mEq/L Bicarbonate: 22 mEq/L 这些实验室值趋向于以下哪个？These laboratory values are trending toward which of the following？
一名最近被诊断患有血色素沉着病的老年妇女的膝盖疼痛和僵硬，类似于骨关节炎。 以下哪项调查最有可能提供诊断？ An elderly woman who was diagnosed recently with haemochromatosis presents with pain and stiffness in her knees resembling osteoarthritis． Which of the following investigations is most likely to provide a diagnosis？
一名15岁女孩表现出瘀伤，鼻epi和重度期。 她最近从病毒感染中康复。 身体检查不明显。 什么是最合适的初步调查？ A 15-year-old girl presents with bruising， epistaxis and heavy periods． She has recently recovered from a viral infection． Physical examination is unremarkable． What is the most appropriate initial investigation？
您是一名进行普通外科手术的内务官员，正在一名65岁的男子的职员中工作，该男子被选择性地接受腹股沟疝修补术。 他过去的病史包括慢性阻塞性肺疾病（COPD）。 他说他已经在6周前做了胸部X光检查。 在手术前，强烈建议您进行以下哪项检查？ You are a house officer in general surgery and are clerking in a 65-year-old man who is being admitted electively for an inguinal hernia repair． His past medical history includes chronic obstructive pulmonary disease （COPD）． He states he has had a chest X-ray over 6 weeks ago． Which investigation is most highly recommended prior to his surgery？
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