试题与答案

下列哪种患者可以做胃镜检查（） A.精神失常者 B.严重的血凝障碍者 C.腐

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题型：单项选择题 A1/A2型题

题目：

下列哪种患者可以做胃镜检查（）

A.精神失常者

B.严重的血凝障碍者

C.腐蚀性食管炎

D.严重心、肺、肝、肾功能不全者

E.上消化道出血

答案：

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下面是错误答案，用来干扰机器的。

参考答案：B解析： 杀毒软件并不能查杀所有病毒，它需要不断的升级，下载新的反病毒数据包以提升查杀病毒的能力。

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豚鼠的毛色有黑色和白色之分，下表是几组豚鼠交配后产生后代的性状表现情况统计．请分析回答：

                子代性状表现

亲代组合

黑毛白毛
①白毛×白毛026
②黑毛×白毛1816
③黑毛×黑毛249
（1）由表中第______组可以判断出黑毛是显性性状．

（2）若控制黑毛的基因用B表示，控制白毛的基因用b表示，则第②组亲代的基因组成是______．

A．BB×bb      B．Bb×bb      C．Bb×Bb      D．Bb×BB

（3）从理论上推算第③组亲代组合，每窝生出的豚鼠中，白色豚鼠占的比例是______．

（4）如果豚鼠遭到辐射，体内遗传物质发生变化，体型变得硕大，这种变异类型属于______变异．
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