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【简答题】
(1)在图①正方形网格中,已知∠AOB及点E、F,现要求只用直尺,分别以E、F为顶点.画∠CEH、∠PFK,使∠CEH与∠AOB互余,且CE与OB互相垂直;使∠PFK与∠AOB互补,且FP ∥ OA,FK ∥ OB. (2)在图②中,已知∠AOB,点E在OB上,请先用量角器画射线EC,使EC⊥EB于E,交OA于C,再用尺规作射线EH,使∠CEH与∠AOB互余,且EH ∥ OA. (保留痕迹,不写作或画法,不说明理由).
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【单选题】下列物产均产自热带地区的是 [     ]
A.
咖啡、香蕉、柑橘
B.
芒果、榴莲、咖啡
C.
苹果、芒果、咖啡
D.
雪梨、柑橘、香蕉
【单选题】His school reports said that he is always ready to __________ a challenge.
A.
receive
B.
get
C.
accept
D.
gain
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【单选题】羊毛为耐酸物质,生产上一般用()浓度的硫酸清洗羊毛。
A.
4%
B.
10%
C.
50%
D.
90%
【判断题】有研究表明,儿童期脑细胞的突触密度远高于成年人,青春期后突触开始减少,因此,儿童期是大脑广泛存储信息的重要时期。( )
A.
正确
B.
错误
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【单选题】羊毛为耐酸物质,生产上一般用多大浓度的硫酸清洗羊毛?
A.
4%
B.
10%
C.
40%
D.
60%
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