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【单选题】
下列关于正平线AB的投影特性说法正确的是()A.
ab || OX ，且长度缩短
B.
a¢b¢|| OX ，且长度缩短
C.
ab || OX ，且长度不变
D.
a¢b¢|| OX ，且长度不变
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反馈参考答案：
举一反三
【简答题】已知：如图BE∥CF，BE、CF分别平分∠ABC和∠BCD，求证：AB∥CD 证明：∵BE、CF分别平分∠ABC和∠BCD（已知） ∴∠1= ∠ _________ ∠2= ∠ _________ （ _________ ） ∵BE∥CF（ _________ ） ∴∠1=∠2（ _________ ） ∴ ∠ABC= ∠BCD 即∠ABC=∠BCD ∴AB∥CD（ _________ ）。
【单选题】You may come into an empty office after you are told that the school principal is expecting you in her office you may be called at the last minute to come to class after you were told that the class i...
A.
criticize the lack of good manners of the American school kids
B.
warn us not to believe others without confirmation
C.
highlight the idea that we should be nice to those people around us
D.
introduce the of April Fool's Day in an way that would interest the readers
【单选题】May 1610, 120 years after , is still a perilous journey.
A.
Columbus
B.
Galileo
C.
Darwin
D.
Montesquieu
【简答题】如图，已知AB⊥CF，DE⊥CF，垂足分别为B、E，AB=DE，请添加一个适当条件，使△ABC≌△DEF，并予以证明。 已知：AB⊥CF，DE⊥CF，AB=DE，_______________。 求证：△ABC≌△DEF。
【简答题】如图，AD ∥ BE ∥ CF，AB=AD=1，BE=2，CF=4，则BC=______．
【简答题】8 They may remain hungry after dinner since the food is even not offered a second time after their polite initially decline
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