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【单选题】
设置前景色和背景色为默认黑白色的快捷键是A.
X
B.
D
C.
V
D.
F
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反馈参考答案：
举一反三
【单选题】What is the main idea of this whole reading?
A.
People of polychronic cultures need to learn how to keep to deadlines and become more organized.
B.
Understanding the two cultural time systems, monochronic and polychronic, may be helpful in getting along with others.
C.
Everyone in the world should adopt the same approach to time since it is annoying when others are different.
【简答题】如图，AB ⊥BD 于点B ，ED ⊥BD 于点D ，AE 交BD 于点C ，且BC=DC. 求证：AB=ED.
【简答题】如图，AB⊥BD于点B，ED⊥BD于点D，AE交BD于点C，且BC=DC．求证：AB=ED．
【简答题】如图，在△ABC中，∠C=90°，∠ABC的平分线交AC于点E，ED⊥AB于D，如果AC=6，则AE+ED=______．
【简答题】如图，已知：CF⊥AB于F，ED⊥AB于D，∠1=∠2， 求证：FG∥BC
【简答题】已知：如图，△ABC中，∠C=90°，∠A=30°，ED垂直平分AB交AB于D，交AC于E．求证：ED=EC．
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