POS系统的定义是什么？有什么特点？

— Excuse me, could you tell me where I could make a call?

— Sorry, I’m a stranger here.

— ____.

A．Thanks a lot

B．That’s a pity

C．Thanks anyway

D．I’m sorry to hear that

2012年北京市的经济又迈上新的台阶，全市地区生产总值达到了1 780 000 000 000元，将1 780 000 000 000用科学记数法表示应为（　　）

A．0.178×10¹³

B．1.78×10¹²

C．17.8×10¹¹

D．1.78×10¹⁰

胆囊结石并发急性胆石性胰腺炎的病理解剖条件中，下列不正确的是（）

A.胆囊管内径较宽

B.胆囊多发小结石

C.共同通道较长

D.出口梗阻

E.有副胰管存在

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.

A．union

B．two

C．numbers

D．between

E．limit

F．contents

G．shows

H．one

I．within

J．enhance

燃油或燃气锅炉房和燃煤锅炉房相比，最大的区别是（）。

A.燃料的供应方式不同

B.耐火等级不同

C.防爆要求不同