抛物线y2=4x的焦点为F,过F且倾斜角等于π3的直线与抛物线在x轴上方的曲线交

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问题:

抛物线y2=4x的焦点为F,过F且倾斜角等于
π
3
的直线与抛物线在x轴上方的曲线交于点A,则AF的长为______.
考点:抛物线的性质(顶点、范围、对称性、离心率)
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外部不经济的存在是导致市场秩序混乱的一个重要原因,消除负外部性的方法很多,其中最重要的现代方法是()。

A.政府利用税收和补贴的手段进行调节

B.合并相关企业,使外部性内部化

C.由政府投资生产相关产品

D.明晰产权

题型:填空题

胸主动脉瘤的临床表现及辅助检查方法。

题型:填空题

某船以固定航向060°航行,该船航行的理想轨迹是()。

A.绕地球一周,最后回到原点

B.逐渐靠近地极,最终到达地极

C.螺旋上升,逐渐趋近地极,但永远达不到地极

D.以上都错

题型:填空题

读写任务(满分20分)

阅读下面的短文,然后按照要求写一篇150词左右的英语短文。

One day, Zeng’s wife decided to go out for shopping, but her little son insisted on going with her to the market. Thinking that she would come back very soon, and that the naughty boy would bring her a lot oftrouble, she was unwilling to do so.

In order to persuade the boy to stay home, she told him, “Oh, come on, good boy, if you listen to Mom and then Mom will give you a present when I am back.”    

“What present are you going to give me, Mom?” asked the son.

“We haven’t eaten meat for a long time, so I will kill our pig and let you enjoy a big nice dinner.” The mother comforted the boy when it happened that their pig was wandering in front of the house. Just at that time, her husband came back and heard what she said. Thinking of the nice meal, the boy gave in.

Not very soon, the mother came back, but what she saw shocked her. It was her husband who had killed the only pig of the poor family.

“Why did you kill it? You know that it is very important for my family.” she scolded him.

“I did that just for your promise!” Mr. Zeng answered.

[写作内容]

1. 以约30个词概括这则中国寓言故事;

2. 以约120个词,从“曾子”或者“曾子之妻”的行为任选一个角度发表你的看法,并包括如下要点:

(1) 你赞同“曾子”还是“曾子之妻”的做法?并说出理由;

(2) 叙述你一次诚实守信的经历,并谈谈你的感受。

[写作要求] 1.可以使用实例来支持你的论点,也可以参照阅读材料的内容论述,但不得直接引用原文中的句子;

题型:填空题

生产中调整时下部段煤气流量()上部段煤气流量。

A、大于

B、小于

C、相等

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