试题与答案

慢性化脓性中耳炎最常见的颅内并发症是() A.硬脑膜下脓肿 B.化脓性脑膜炎 C.乙

题型:单项选择题

题目:

慢性化脓性中耳炎最常见的颅内并发症是()

A.硬脑膜下脓肿

B.化脓性脑膜炎

C.乙状窦血栓性静脉炎

D.脑脓肿

E.硬脑膜外脓肿

答案:

参考答案:E

解析:硬脑膜外脓肿是发生于颅骨骨板与硬脑膜之间的化脓性炎症和脓液蓄积,是最常见的耳源性颅内并发症,约占其1/3。

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已知:A、B、C、D、E、F为原子序数依次增大的六种短周期元素。常温下,六种元素的常见单质中三种为气体,三种为固体。A与E,D与F分别同主族,A能与B、C、D分别形成电子数相等的三种分子,C、D的最外层电子数之和与E的核外电子总数相等。试回答下列问题:

(1)写出下列元素的元素符号:______ C_______,F_______。

(2)化合物C2A2是种高能量分子,且C原子满足最外层8电子稳定结构,写出C2A2的电子式: ______________

(3)分子式为A2B2D4的化合物与含等物质的量KOH的溶液反应后所得溶液呈酸性,其原因是___________________________________(用文字表述)。

(4)由A、C、D、F和Fe五种元素可组成类似明矾的化合物Z(化学式量为392)   ,1 mol Z中含有6 mol结晶水。对化合物Z进行如下实验:

a. 取Z的溶液,加入过量NaOH浓溶液并加热,产生白色沉淀和无色剌激性气味气体。白色沉淀迅速变灰绿色,最终变为红褐色;

b. 另取Z的溶液,加人过量BaCl2溶液产生白色沉淀,加盐酸沉淀不溶解。

①Z的化学式为_____________________

②已知100mL 1 mol • L-1 Z溶液能与20mL 1 mol • L-1KMnO4溶液(硫酸酸化)恰好反应,写出该反应的离子方程式:_____________________

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