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

场景(二)

根据场景(二)，回答下列问题：

针对场景材料，为预防出现衬砌裂损现象可采取的措施有( )。

A．堵塞衬砌背后的渗流水，集中引导排出

B．钢筋保护层必须保证不小于3cm，钢筋使用前应作除锈、清污处理

C．混凝土强度宜采用较小水灰比和骨灰比，合理选用外加剂

D．混凝土拆模时，内外温差不得大于20℃

E．衬砌背后如有可能形成水囊，应对围岩进行止水处理，根据设计施作防水隔离层