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问题 单项选择题

苷类化合物的结构中非糖部分称为

A．配糖体

B．苷元

C．端基碳原子

D．苷键

E．糖

答案

参考答案：B

解析：苷类是糖或糖的衍生物与另一非糖物质通过糖的端基碳原子连接而成的一类化合物，又称为配糖体。苷中的非糖部分称为苷元或配基。

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.

（61）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

下列物质中，属于有机物的是（　　）

A．甲烷

B．碳酸钠

C．一氧化碳

D．四氧化三铁
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