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【简答题】
如图，半径为1的半圆内接等腰梯形，其下底是半圆的直径，试求： （1）它的周长y与腰长x之间的函数关系式，并求出自变量x的取值范围． （2）当腰长为，周长有最大值？这个最大值为多少？
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举一反三
【单选题】In the eyes of the author, what happens to a scholar who shares his ideas with his colleagues?______.
A.
He risks his ideas being stolen.
B.
He gains recognition for his achievement.
C.
He is considered as an eccentric.
D.
He is credited with a startling discovery.
【单选题】2014年 5月 4日,习近平总书记在北京大学师生座谈会上说,道德之于个人、之于社会,都具有基础性意义,做人做事第一位的是
A.
崇德修身
B.
礼义廉耻
C.
学习知识
D.
干好工作
【简答题】1-m sure that he'll change his ideas．（改为同义句） He______ ______ ______ ______his ideas，
【单选题】What will happen to a scholar who shares his ideas with his colleagues in the author's opinion?
A.
He gains recognition for his achievements.
B.
He attracts large numbers of students.
C.
He risks his ideas being stolen.
D.
He is considered slightly mad.
【简答题】Great as Newton was, many of his ideas ____________ today and are being modified by the work of scientists of our time. A) are to challenge B) may be challenged C) have been challenged ...
【简答题】Great as Newton was, many of his ideas ____________ today and are being modified by the work of scientists of our time. A) are to challenge B) may be challenged C) have been challenged D) are challeng...
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