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问题描述：

[单选] 下列五种物质中均含有氮元素，它们是按氮元素的化合价由低到高的顺序排列的: ①NH3 ②N2 ③NO ④X ⑤N2O5。根据排列规律，X不可能是（）
A．N2O3 B．N2O4 C．NaNO2 D．NaNO3
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随机题目

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？
您是进行结直肠手术的房屋管理员，正在一名68岁的男子的干事中，该男子计划在下周进行前切除术。 他过去的病史包括缺血性心脏病，但无心肌梗塞病史。 建议在他手术之前进行以下检查，除了？ You are a house officer in colorectal surgery and are clerking in a 68-year-old man who is planned for an anterior resection the following week． His past medical history includes ischaemic heart disease but no history of a myocardial infarction． The following investigations are all recommended prior to his surgery EXCEPT？
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您会看到一位48岁的卡车司机，他会给您提供饭后三个月的胃灼热病史，而这还没有与抗酸剂和PPI一起解决。 您怀疑患者患有裂孔疝。 诊断裂孔疝最合适的检查方法是：You see a 48-year-old lorry driver， who presents to you with a three-month history of heartburn after meals which has not been settling with antacids and PPIs． You suspect that the patient has a hiatus hernia． The most appropriate investigation for diagnosing a hiatus hernia is:
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