已知线段a、b(a>2b),以a、b为边作等腰三角形,则( )
A:只能作以a为底边的等腰三角形
B:只能作以b为底边的等腰三角形
C:可以作分别以a、b为底边的等腰三角形
D:不能作符合条件的等腰三角形
已知α为锐角,cos(α+π4)=55.
求tan(α+π4)的值;
拆开图1中玩具,发现电源、开关、发光二极管(简称“LED”)、电动机(符号“ ”)各一个及连接导线,闭合开关,电动机顺时针转动,LED亮,将电动机一端连线断开,闭合开关,LED亮.
假如你应邀参加一个国际读书会,并将分享自己读过的一本好书。请根据下列表格中的要点,用英语写一篇短文,介绍你要分享的书。
Key points(要点)
Words and expressions for reference(参考词汇)
What the name is
The Old Man and the Sea
…
Who wrote it
Ernest Hemingway, America
What it is about
Fisherman,
Fight against fish and nature
Why I like it
Meaningful, never give up,
Well-known sentence: "Man is not made for defeat(失败).", …
Interesting, helpful, …
Well-known sentence: …
注意:1)可选择使用所给的书名及内容,也可另选书籍;
2)短文内容可适当增加;
3)文中不得出现真实的人名和校名;
4)词数:80~100;
5)短文首句仅供选择使用,不计入总词数。
短文首句:
The book I'd like to share with you is The Old Man and the Sea.