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问题 单项选择题

常规剂量苯二氮草类药物引起老年人小脑共济失调是由于

A．肾脏代谢减慢，血药浓度升高
B．肝脏灭活能力减弱，使药物蓄积
C．脑细胞数目减少，对药物反应敏感
D．半衰期延长
E．蛋白结合率降低

答案

参考答案：C

单项选择题

In recent years, one of the more popular topics for panel discussions at computer conferences and trade (61) has been the "RISC versus CISC" debate.

RISC processors feature a small number of instructions that each executes in (62) machine cycle. CISC processors use complex instructions that can take several cycles to execute.

The RISC versus CISC debate won’t be decided by panel discussion; it will be won in the marketplace. And the deciding factor may have little to do with (63) of instructions and registers and more to do with parallelism.

Since their conception, RISC processors have been evolving toward micro parallelism, incorporating parallel-processing features (64) the processor, RISC processors feature pipelining, whereby many instructions can be decoded while one instruction executes. RISC processors, however, are moving toward pipelines for each unit of the processor.

CISC processors also employ pipelining. They have many integer instructions that execute in one cycle, but the varying execution times of CISC instructions (65) the effectiveness of parallelism.

（62）处是（）

A.union

B.twoC.numbers

D.between

E.limit

F.contents

G.shows

H.one

I.within

J.enhance
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选择题

生活中可能遇到的下列混合物，能按“溶解--过滤--蒸发”的步骤加以分离的是：[ ]

A．食盐和细沙

B．水和酒精

C．石灰石和熟石灰

D．蔗糖和味精

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