逻辑设计的目的是什么？

     阅读下面短文，掌握其大意，根据所给汉语提示，写出空缺处各单词的正确形式，使短文完整、达意，每空限填一词。

Dear Patrick,

     I got a new job today helping a nice family do the housework. In the Peterson family, there are 1______

(四) kids, two cats and two 2______ (鸟), so there's a lot to do. I have to cook a meal once a week. I've

already thought 3______ (关于) the first meal I will cook. I'll make a 4______ (水果) salad and if I have time

I'll also make a 5______ (蛋糕). After the meal, of course, I'll 6______ (洗) the dishes. During the day, I need

to make beds and do some 7______ (打扫). Then I have to do the weekly shopping and pick up the kids from

school and make sure they do their 8______ (家庭作业). Sounds like a busy day? There's more, much more.

Whew, I think it will take 9______ (更长久) than one day a week to 10______ (完成) all these chores.

                                                                                                                               Robert

李某，男，18岁。平时性情急躁，患痫证，时有发作，昏仆不知人，伴有肢体抽动，口吐涎沫，喉中痰鸣，发作后一如常人。舌红苔黄腻，脉象弦滑而数。乃痰火内盛的痫证。痫证频繁发作期，治疗应该（）

A.治标，不治本

B.治本，不治标

C.先治标为主，后治本

D.先治本为主，后治标

E.标本并重

在面向对象方法中，类的实例称为 _________。

水平圆盘排种器的构造工作过程及特点是什么？