某企业只生产一种产品，月初“生产成本”账户余额为3000元，本期生产过程中领用原材料

(1)求双曲线9x²-25y²=225的实轴长、虚轴长、焦点坐标、准线方程、渐近线方程、离心率.
(2)设直线y=ax+b与双曲线3x²-y²=1交于A、B，以AB为直径的圆过原点，求点P(a，b)的轨迹方程．

组装需要吻合对孔的部件，严禁用（）探摸孔槽，必要时应以工具拨动。

The nurse evaluates the client’s understanding of myasthenia gravis. The nurse would judge that the client has formed a realistic concept of her condition when she says()

A. "By taking medication and pacing activities, I will live longer, but ultimately the disease will cause my death. "

B. "By taking medication and pacing activities, my fatigue will be relieved, but I should expect occasional periods of muscle weakness. "

C. "By taking medication and pacing activities, my symptoms will be controlled and eventually the disease will be cured. "

D. "By taking medication and pacing activities, I should be able to control the disease and enjoy a healthy lifestyle. \

在电脑设计中常用的颜色模式有哪几种？