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龈下刮治放入器械时，工作端平面与牙根面之间的最佳角度是
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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 Read the following text. Choose the best word (s) for each numbered blank and mark A, B, C or D on ANSWER SHEET 1.4（）
公路水运工程质量事故鉴定、大型水运工程项目和高速公路项目验收的质量鉴定检测，质监机构应当委托通过计量认证并具有甲级资质的检测机构承担。( )
建设部工程质量管理条例中规定，施工单位在施工中偷工减料的，使用不合格的建筑材料、建筑构配件和设备的行为的，责令改正，处工程合同价款2%以上4%以下的罚款。( )
可摘局部义齿固位体的颊、舌臂和各固位体之间，尽量有
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