工业上制造镁粉是将镁蒸气在气体中冷却．可作为冷却气体的是（ ） ①空气 ②CO2

As one works with color in a practical, or experimental way, one is impressed by two apparently unrelated facts. Color as seen is a mobile, changeable thing (1) to a large extent on the relationship of the color (2) other colors (3) simultaneously. It is not (4) in its relation to the direct stimulus which (5) it. On the other hand, the properties of surfaces that give (6) to color do not seem to change greatly under a wide variety of illumination color, usually (but not always) looking much the same in artificial light as in daylight. Both of these effects seem to be (7) in large part to the mechanism of color (8) .

When the eye is (9) to a colored area, there is an immediate readjustment of the (10) of the eye to color in and around the area (11) . This readjustment does not promptly affect the color seen but usually does affect the next area to which the (12) is shifted. The longer the time of viewing, the higher the (13) , and the larger the area, the greater the effect will be (14) its persistence in the (15) viewing situation. As indicated by the work of Wright and Schouten, it appears that, at (16) for a first approximation, full adaptation takes place over (17) time if the adapting source is moderately bright and the eye has been in (18) darkness just previously. Also, (19) of the persistence of the effect if the eye is shifted around from one object to another, all of which are at similar brightness or have similar colors, the adaptation will tend to become (20) over the whole eye.

15（）

A.transparent

B.succeeding

C.simultaneous

D.proceeding

股前外侧皮瓣设计时，需要在下肢画出的线有（）

A.髂前上棘至髌骨外上缘连线

B.髂前上棘至髌骨外上缘连线中点至腹股沟中点连线

C.腹股沟中点至髌骨外上缘连线

D.髂前上棘至髌骨外上缘中点连线

E.腹股沟中点至髌骨外缘中点连线

纤维素性心包炎

润滑油的一般特性是什么？

比尔·盖茨每秒进账2500美元，但他没有坐享每秒钟2500美元的进账。他在42岁的精力旺盛时期，却悄然“退居二线”，把公司的日常运作交给了他的“亲密战友”负责，自己则专注于未来新软件的开发，因为他清醒地认识到“微软离破产永远只有18个月”。这表明（）

A.不断创新才能推动事物的发展

B.发展需要经历一个曲折的过程

C.解放思想是办事情取得成功的关键

D.财富总是属于头脑清醒的人