空气预热器使（）燃烧和（）系统需要的空气温度得到提高，同时减少（）损失。

肺泡表面活性物质减少将会使

A．肺弹性阻力减小

B．肺顺应性增大

C．肺泡内液体层表面张力减小

D．小肺泡内压大于大肺泡内压

※ [7～10]. ( 3 )

A．

B．

C．

D．

基本形逐渐地向外或向内扩大或缩小，有规律地变化即为（）

A.重复

B.对称

C.近似

D.渐变

Although the bulk of industry resources and energies have focused on developing the fastest (11) or slickest (12) , more and more mindshare is turning to the evolution of the computer interface. Advancements in the areas of input devices, (13) processing and virtual reality could lead to fundamental changes in the way human and computer interact. The technological battlefield of the future will be adding layers between the user and the raw machine to make the (14) as invisible as possible. (15) represents the next evolutionary step for the interface.

A．microprocessor

B．operating systems

C．voice

D．interface

在机场图中“PALS”表示：（）.

A.精密进近灯光系统

B.简易进近灯光系统

C.跑道中线灯

D.跑道边灯