JPA（Java Persistence API)是Sun官方提出的Java持久化规范。它为Java开发人员提供了一种对象/关联映射工具来管理Java应用中的关系数据。（)

A.presentation

B.preservation

C.perseverance

D.persistence

ently 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.

A．liable

B．focusing

C．typical

D．depending

A.Java开发工具

B.Java虚拟机

C.Java运行环境

D.Java编辑器

A.Java编译器

B.Java运行环境

C.Java开发环境

D.Java虚拟机答

A..java

B..class

C..docx

D..cpp

A.Java文档生成工具

B.Java运行工具

C.Java打包工具

D.Java编译工具

A.AJava解释器

B.Javah头文件生成器

C.Java编译器

D.JavadocAPI文件产生器

A.FORTRAN

B.C++

C.Java

D.Flash

A.//

B./

C.//

D./