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【简答题】
如图，直角坐标系中，点A的坐标为（a，0），以线段OA为四象限内作等边△AOB，点C为x正半轴上一动点（OC＞a＞0），连接BC，以线段BC为四象限内作等边△CBD，直线DA交y轴E． （1）求证：OC=AD． （2）随着点C位置的变化，点E的位置是否会发生变化？若没有变化，求出点E的坐标；若有变化，请说明理由． （3）当C点运动到使OA：AC=1：3时，求出此时D点的坐标．
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参考答案：
举一反三
【单选题】Which land in Gulliver's Travels is the land of the giants?
A.
Lilliput.
B.
Brobdingnag.
C.
Laputa.
D.
The land of the Houyhnhnms.
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【单选题】Most parents think there are differences in their approach _______ their children compared with that of their parents. [      ]
A.
to educate
B.
about educating
C.
to educating
D.
of educating
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【简答题】Exercise I. Listen and rearrange the order of the following topics by writing a number from I to 5 beside each of them. The first one has been done for you. Plants growing in the tundra ( ) Locatio...
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【单选题】Most parents are not __________ the danger of their babies' eating jelly, which causes most unfortunate incidents to happen. [     ]
A.
well aware to
B.
very aware of
C.
aware that
D.
well aware of
查看完整题目与答案
【简答题】The concept of a national park differs from nation to nation. In Australia, the United States and Japan the land in national parks is government-owned and the management of these parks is decided by ...
查看完整题目与答案
【单选题】在一定的条件下,电弧稳定燃烧时,电弧作用于静特性曲线的上升区间的焊接方法,即随电流增大,电压增大的焊接方法有_____
A.
焊条电弧焊
B.
小电流钨极氩弧焊
C.
大电流钨极氩弧焊
D.
正常电流密度的埋弧焊
E.
大电流密度埋弧焊
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【单选题】深秋，某青年被火车碾伤，右踝部及左小腿下段碾挫伤完全离断，当时经当地卫生所止血处理，断肢无菌敷料包扎，10小时后送大医院。处理方法是（）
A.
双侧残端清创缝合
B.
两侧小腿中段截肢
C.
两侧断肢再植
D.
左侧断肢再植于右侧
E.
右侧小腿截肢，左侧断肢再植
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【判断题】焊条电弧焊电弧稳定燃烧时,电弧的静特性线处于水平段,要求外特性线与电弧静特性线水平段相交,即要求焊条电弧焊的电源应该具有下降的外特性。
A.
正确
B.
错误
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【简答题】Task 2 The idea of a national park differs from nation to nation. In Australia, the United States and Japan, the land in national parks is government-owned and the management of these parks is decided...
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【单选题】患者,女性,45岁,因饱餐后现右下腹疼痛而入院,诊断为胆囊结石,应忌食()
A.
蛋白食物
B.
纤维食物
C.
高热量食物
D.
油膩食物
E.
高维生素食物
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相关题目：
【单选题】Which land in Gulliver's Travels is the land of the giants?
A.
Lilliput.
B.
Brobdingnag.
C.
Laputa.
D.
The land of the Houyhnhnms.
查看完整题目与答案
【单选题】Most parents think there are differences in their approach _______ their children compared with that of their parents. [      ]
A.
to educate
B.
about educating
C.
to educating
D.
of educating
查看完整题目与答案
【简答题】Exercise I. Listen and rearrange the order of the following topics by writing a number from I to 5 beside each of them. The first one has been done for you. Plants growing in the tundra ( ) Locatio...
查看完整题目与答案
【单选题】Most parents are not __________ the danger of their babies' eating jelly, which causes most unfortunate incidents to happen. [     ]
A.
well aware to
B.
very aware of
C.
aware that
D.
well aware of
查看完整题目与答案
【简答题】The concept of a national park differs from nation to nation. In Australia, the United States and Japan the land in national parks is government-owned and the management of these parks is decided by ...
查看完整题目与答案
【单选题】在一定的条件下,电弧稳定燃烧时,电弧作用于静特性曲线的上升区间的焊接方法,即随电流增大,电压增大的焊接方法有_____
A.
焊条电弧焊
B.
小电流钨极氩弧焊
C.
大电流钨极氩弧焊
D.
正常电流密度的埋弧焊
E.
大电流密度埋弧焊
查看完整题目与答案
【单选题】深秋，某青年被火车碾伤，右踝部及左小腿下段碾挫伤完全离断，当时经当地卫生所止血处理，断肢无菌敷料包扎，10小时后送大医院。处理方法是（）
A.
双侧残端清创缝合
B.
两侧小腿中段截肢
C.
两侧断肢再植
D.
左侧断肢再植于右侧
E.
右侧小腿截肢，左侧断肢再植
查看完整题目与答案
【判断题】焊条电弧焊电弧稳定燃烧时,电弧的静特性线处于水平段,要求外特性线与电弧静特性线水平段相交,即要求焊条电弧焊的电源应该具有下降的外特性。
A.
正确
B.
错误
查看完整题目与答案
【简答题】Task 2 The idea of a national park differs from nation to nation. In Australia, the United States and Japan, the land in national parks is government-owned and the management of these parks is decided...
查看完整题目与答案
【单选题】患者,女性,45岁,因饱餐后现右下腹疼痛而入院,诊断为胆囊结石,应忌食()
A.
蛋白食物
B.
纤维食物
C.
高热量食物
D.
油膩食物
E.
高维生素食物
查看完整题目与答案
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