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问题 单项选择题

关于基址寻址和变址寻址，下列说法中错误的是______。

A．两者都可扩大指令的寻址范围
B．两者在取操作数之前都需要对有效地址进行计算
C．在程序执行过程中，基址寄存器的内容不可变，变址寄存器中的内容可变
D．基址寄存器和变址寄存器的内容都由用户确定

答案

参考答案：D

解析： 基址寄存器常用来实现多道程序，其内容一般由操作系统确定，故D选项错误。

多项选择题 案例分析题

病历摘要：男性患者，45岁，因饱餐后突发上腹部疼痛10h入院。疼痛呈持续性绞痛，拒按，伴恶心、呕吐，呕出胃内容物及黄水。1h前出现手足抽搐。小便量减少。既往无上腹部疼痛病史。入院查体：T38.6℃，BP90／60mmHg，P110次／min，R20次／min。痛苦面容，皮肤巩膜无黄染。心率110次／min，心肺余无异常，肠鸣音1次／min。

下一步最好再做哪些生化及影像学检查（）。

A.胃镜检查

B.X线腹部平片

C.腹部B超

D.胰腺CT检查

E.血常规

F.血清淀粉酶测定

G.便隐血试验

H.心电图
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