加速度不变的运动（ ） A．可能是曲线运动 B．一定是曲线运动 C．可能是圆周运

In "quick-response" manufacturing, the manufacturer receives electronic feedback directly from retailers about which models, patterns, or styles are selling, and in what quantities. This feedback triggers the manufacture of further batches to replenish stocks of articles that have been sold. The advantage for retailers is that they are freshly stocked with just those articles that are most likely to sell.
For quick-response manufacturing to work to the retailer’s advantage in the respect mentioned above, which of the following must be true

A．The cost per piece of manufacturing various articles in small batches exceeds the cost per piece of manufacturing large quantities of those articles.

B．The equipment necessary to provide the direct feedback is different from the equipment that supports conventional inventory control.

C．Consumers do not patronize a store that does not stock the model, pattern, or style that they prefer.

D．Consumers can distinguish retailers that rely on quick-response manufacturing from retailers that do not.

E．(E) Consumers do not suddenly stop buying models patterns, or styles that have just become popular.

图示铜污染对形态、解剖和生理特征上相似的甲乙两种水蚤的影响。图a和b中虚线左侧曲线表示它们在含铜浓度分别为10μg/L及30μg/L 的培养液中数量变化情况，虚线右侧曲线表示它们在无铜的适宜培养液中的数量变化情况。

(l)甲乙两种生物之间的关系是____。

(2)图a显示的结果表明，第21天与第5天相比，甲与乙的____发生了改变。

(3)比较a、b两图，还能得出的结论是①．__________________；②．_________________。

疟原虫感染人体后进入肝细胞繁殖成熟后进入（）

A.CD4⁺细胞

B.CD8⁺细胞

C.白细胞

D.淋巴细胞

E.红细胞

“纸上得来终觉浅．绝知此事要躬行”，陆游这一名句强调的是（）

A.实践是认识的来源

B.实践是推动认识发展的动力

C.实践是认识的目的

D.间接经验毫无用处

由大望远镜拍摄制作的星团等深空天体的照片，其上各种或苍白或绚烂的色彩均是人眼可见。