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《神奇校车》是美国国家图书馆推荐给所有学龄前儿童和小学生的课外自然科普读物，是全美最受欢迎的儿童自然科学图书系列之一。1994年，美国Scholastic集团将其改编成动画片推上银幕。在一次次不可思议的神奇之旅中，让孩子们体验原理、学会操作、懂得思考、爱上科学。B) Use the tool BlueJ. The biggest advantage of BlueJ is that it provides a simple class diagram. As I did in the concise design pattern Java, I seldom draw class diagrams specifically, but take screenshots in BlueJ. When students write demonstration programs on the computer, they often look at his class diagram first to judge whether his program is correct or not, and then look at the source code when necessary.武十郎，自小被母亲装扮成男孩子，养成男性化的阳刚性格。在父亲武丁当(张国立饰)的教导及熏陶下，习得一身好武艺，性格执着，爱抱打不平，拥有强烈的正义感。　　一樁天經地義的大事，卻交給一個乞丐。Achievements cannot be made alone.赵耘笑喷了，合着人家都是不清不楚的，就你们兄弟是好的？见他着急的模样，似乎内中另有隐情，便沉吟道：让我想想。In fact, we also need to pay attention to one thing, Because when a packet passes through a chain, All the rules of the current chain are matched, However, there must always be an order when matching. We should match one by one, and we said that rules of the same functional type will gather in a "table". Then, which rules in the "table" will be executed at the front of the "chain"? At this time, there needs to be a priority problem. We also take prerouting "chain" as an illustration.