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【简答题】
在一次研究性学习活动中，某小组将两张互相重合的正方形纸片ABCD和EFGH的中心O用图钉固定住，保持正方形ABCD不动，顺时针旋转正方形EFGH，如图所示． （1）小组成员经观察、测量，发现在旋转过程中，有许多有趣的结论．下面是旋转角度小于90°时他们得到的一些猜想： ①ME=MA； ②两张正方形纸片的重叠部分的面积为定值； ③∠MON保持45°不变． 请你对这三个猜想作出判断（正确的在序号后的括号内打上“√”，错误的打上“×”）： ①（　　）；②（　　）；③（　　） （2）小组成员还发现：（1）中的△EMN的面积S随着旋转角度∠AOE的变化而变化．请你指出在怎样的位置时△EMN的面积S取得最大值．（不必证明） （3）上面的三个猜想中若有正确的，请选择其中的一个给予证明；若都是错误的，请选择其一说明理由．
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参考答案：
举一反三
【单选题】As a writer he is ____; But as a teacher he is _________.
A.
a success; a failure
B.
success; failure
C.
success; a failure
D.
a success; failure
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【单选题】What can be inferred from the appointment of Webster to investigate the incident?
A.
He headed the FBI and knew it well.
B.
The Fort Hood incident is no easy case.
C.
Director Robert Mueller had confidence in Webster.
D.
He has headed many investigations into public agencies.
查看完整题目与答案
【单选题】My father asked me ______ with me.
A.
what the matter is
B.
what the mater was
C.
what is the matter
D.
what was the matter
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【单选题】同类型的表面活性剂不同给药途径毒性大小是( )
A.
静脉注射>口服>外用
B.
口服>静脉注射>外用
C.
外用>口服>静脉注射
D.
口服>外用>静脉注射
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【简答题】He is ________ a writer as a reporter [A] more [B] rather [C] not so much [D] not such
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【多选题】在肉类腌制品中最常用的护色剂有( )( )( )( )( )
A.
亚硝酸钠
B.
亚硝酸钾
C.
硝酸钠
D.
硝酸钾
E.
烟酰胺
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【简答题】This is what _________ intends to investigate.
查看完整题目与答案
【多选题】下列哪些属于可再生资源?
A.
农作物
B.
森林
C.
太阳能
D.
天然气
E.
铁
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【单选题】下列哪些属于可再生资源( )
A.
太阳能
B.
煤
C.
石油
D.
天然气
查看完整题目与答案
【单选题】What is the Competition Commission going to investigate?
A.
Whether adequate investment is being made to improve airport facilities.
B.
Whether the British Airports Authority should sell off some of its assets.
C.
Whether the Spanish company could offer better service.
D.
Whether more airports should be built around London.
查看完整题目与答案
相关题目：
【单选题】As a writer he is ____; But as a teacher he is _________.
A.
a success; a failure
B.
success; failure
C.
success; a failure
D.
a success; failure
查看完整题目与答案
【单选题】What can be inferred from the appointment of Webster to investigate the incident?
A.
He headed the FBI and knew it well.
B.
The Fort Hood incident is no easy case.
C.
Director Robert Mueller had confidence in Webster.
D.
He has headed many investigations into public agencies.
查看完整题目与答案
【单选题】My father asked me ______ with me.
A.
what the matter is
B.
what the mater was
C.
what is the matter
D.
what was the matter
查看完整题目与答案
【单选题】同类型的表面活性剂不同给药途径毒性大小是( )
A.
静脉注射>口服>外用
B.
口服>静脉注射>外用
C.
外用>口服>静脉注射
D.
口服>外用>静脉注射
查看完整题目与答案
【简答题】He is ________ a writer as a reporter [A] more [B] rather [C] not so much [D] not such
查看完整题目与答案
【多选题】在肉类腌制品中最常用的护色剂有( )( )( )( )( )
A.
亚硝酸钠
B.
亚硝酸钾
C.
硝酸钠
D.
硝酸钾
E.
烟酰胺
查看完整题目与答案
【简答题】This is what _________ intends to investigate.
查看完整题目与答案
【多选题】下列哪些属于可再生资源?
A.
农作物
B.
森林
C.
太阳能
D.
天然气
E.
铁
查看完整题目与答案
【单选题】下列哪些属于可再生资源( )
A.
太阳能
B.
煤
C.
石油
D.
天然气
查看完整题目与答案
【单选题】What is the Competition Commission going to investigate?
A.
Whether adequate investment is being made to improve airport facilities.
B.
Whether the British Airports Authority should sell off some of its assets.
C.
Whether the Spanish company could offer better service.
D.
Whether more airports should be built around London.
查看完整题目与答案
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