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【多选题】
使用红包后，如果发生了退款，以下对于红包描述正确的是（）A.
退款成功后，红包已过有效期但在（有效期+90天）的时间内：红包会退还，红包使用到期时间延长到（有效期+90天）
B.
退款成功后，红包已过（有效期+60天）：红包退回后有效期不变，过期不可使用
C.
退款成功后，红包还在有效期内：红包会退还，且有效期不变
D.
红包不可以退回
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】耦合电感 L 1 = L 2 = 3H ,耦合因数 ,则互感 M 为 ( ) 。
【单选题】Writers paint pictures in words and use figurative languages to produce_______ in their description or narration.
A.
ideas
B.
meaning
C.
images
D.
conclusion
【单选题】English writers are more “direct” than Chinese writers means that ______.
A.
Chinese writers don’t express their points in writing
B.
English writers often state the main idea at the end of a paragraph
C.
Chinese writers often express their purpose when they start an essay
D.
English writers often place their central idea in the introductory paragraph
【单选题】English writers are more “direct” than Chinese writers means that ______.
A.
Chinese writers don’t express their points in writing
B.
English writers often state the main idea at the end of a paragraph
C.
English writers often place their central idea in the introductory paragraph
D.
Chinese writers often express their purpose when they start an essay
【多选题】下列哪些元件是该回路的组成元件?
A.
两位五通电磁换向阀
B.
与阀
C.
两位三通手动换向阀
D.
或阀
E.
快速排气阀
F.
两位五通双气控换向阀
G.
气动三联件
【简答题】已知：a 2 ﹣b 2 =（a﹣b）（a+b）；a 3 ﹣b 3 =（a﹣b）（a 2 +ab+b 2 ）；a 4 ﹣b 4 =（a﹣b）（a 3 +a 2 b+ab 2 +b 3 ）；按此规律，则： （1）a 5 ﹣b 5 =（a﹣b）（ _________ ）； （2）若a﹣ =2，你能根据上述规律求出代数式a 3 ﹣ 的值吗？
【单选题】Roald Dahl was a great children's writer. His dark past helped him paint a picture ________ was different to most other writers.
A.
that
B.
who
C.
/
D.
whom
【简答题】已知：a 2 -b 2 =（a-b）（a+b）；a 3 -b 3 =（a-b）（a 2 +ab+b 2 ）；a 4 -b 4 =（a-b）（a 3 +a 2 b+ab 2 +b 3 ）；按此规律，则： （1）a 5 -b 5 =（a-b）（______）； （2）若a- 1 a =2，你能根据上述规律求出代数式a 3 - 1 a 3 的值吗？
【简答题】先化简，再求值： （1）（4a 2 -3a）-（2a 2 +a-1）+（2-a 2 +4a），其中a=2． （2）已知A=3a 2 -5ab-b 2 ，B=-2a 2 +3ab+b 2 ，其中a=-1， b= 2 3 ，求-3（A-B）+2（B+3A）的值．
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