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【单选题】
,球墨铸铁经( )可获得珠光体基体的球墨铸铁,从而提高其强度和耐磨性。A.
正火；
B.
退火；
C.
调质
D.
回火,
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举一反三
【单选题】Why did the agent take a picture of one of the women at the brief moment she faced his direction?
A.
because he knew one of the two women and wanted to take a picture of her.
B.
because that was one of the few exciting things in his job.
C.
because he was well-trained as a secret agent.
D.
because he was so bored and wanted to entertain himself.
【简答题】如图，在△ABC中，∠C=90°，D是BC边上任意一点，DE垂直平分AB，垂足为E，且DE=DC． （1）求∠B的度数； （2）若CD=3，求AB的长．
【单选题】Why did the agent take a picture of one of the women at the brief moment she faced his direction?
A.
Because he knew one of the two women and wanted to take a picture of her.
B.
Because that was one of the few exciting things in his job.
C.
Because he was well-trained as a secret agent.
D.
Because he was so bored and wanted to entertain himself.
【简答题】如图，在△ABC中，D是BC边上的任意一点，AH⊥BC于H，图中以AH为高的三角形的个数为（ ）个。
【简答题】附加题：已知：如图，点O是等腰直角△ABC斜边AB的中点，D为BC边上任意一点． 操作：在图12中作OE⊥OD交AC于E，连接DE． 探究OD、BD、CD三条线段之间有何等量关系？请探究说明．
【多选题】中国革命主要就是打击两个敌人,它们分别是( )。
A.
帝国主义
B.
官僚资本主义
C.
封建主义 E.农民阶级
D.
在经济上消灭封建制度
E.
在军事上改变落后状态
【简答题】在 △ABC中,D是BC边上任意一点(D与B,C不重合),且 = + .求证:△ABC为等腰三角形.
【单选题】如图，已知：在△ABC中，AB=AC，D是BC边上任意一点，DF⊥AC于点F，E在AB边上，ED⊥BC于D，∠AED=155°，则∠EDF等于 [ ]
A.
50°
B.
65°
C.
70°
D.
75°
【简答题】在△ABC中，∠A= π 6 ，D是BC边上任意一点（D与B、C不重合），且丨 AB | 2 = | AD | 2 + BD ? DC ，则∠B=______．
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