已知等差数列an前17项和S17=51,则a5-a7+a9-a11+a13=____

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问题:

已知等差数列an前17项和S17=51,则a5-a7+a9-a11+a13=______.

A.3
B.6
C.17
D.51

考点:教师招聘考试中学教师招聘笔试教师公开招聘考试中学数学
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试述法律规则与法律原则的关系。

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计量器具相邻两次检定的时间间隔为()。

A.检定时间

B.检定周期

C.周期检定

D.使用周期

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马克思在《 * * 党宣言》中指出:“资产阶级,由于一切生产工具的迅速改进,由于交通的极其便利,把一切民族甚至最野蛮的民族都卷进文明中来了。……它迫使一切民族——如果它们不想灭亡的话——采用资产阶级的生产方式——它按照自己的面貌为自己创造出一个世界。”下列史实,可以印证这一观点的是()①法国启蒙运动②俄国农奴制改革③明治维新运动④戊戌维新运动

A.①②③

B.②③

C.②③④

D.③④

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(36) have greeted Queen Elizabeth Ⅱ as she appeared outside (37) in a pink suit and hat on her 80th birthday. And (38) working grandmother shows no signs of slowing down and has genes on her side -- her mother died at 101. Queen Elizabeth’s husband, Prince Philip, followed close behind as she (39) the castle’s King Henry VIII gate, Voice of America reports. A military (40) played and a 21-gun salute (41) nearby ahead of another 41-gun salute in London’ s Hyde Park later in the day Friday. Prince Charles is (42) a birthday dinner for the (43) at a palace in London’s Kew Gardens. Queen Elizabeth has received 37,000 birthday cards and e-mails from around the world, according to (44) Queen Elizabeth Ⅱ issued a (45) saying she (46) by the messages. In an ITV News survey, Elizabeth was (47) the most popular royal. Bottom of the survey came Camilla Parker-Bowles, Duchess of Cornwall, who last year married the queen’s eldest son, Charles, after a tortuous 35-year (48) . In her 80s, Queen Elizabeth Ⅱ remains perhaps the most (49) . She is known for her penchant for brightly colored suits and hats. French designer Sonia Rykiel once criticized the Queen of England about the way she dresses. She called the Queen "the worst dressed person in the UK". "The Queen is one of the worst dresses people in the UK. She should stop wearing those bright suits and hats ..." Sonia Rykiel said. "A woman in her position should start dressing in a more (50) and serious manner." Frankly, we sold our Sonia Rykiel sweaters cardigans on eBay (51) after this interview. According to a senior royal aide, "The Queen proudly wears British designers. She wears (52) and stylish clothing which is right for the kind of work she does." Her main (53) include (54) photography, and dogs, especially her Pembroke Welsh Corgis. Queen Elizabeth II is Europe’s (55) living monarch. And lest we forget, Queen Elizabeth Ⅱ is the Queen of Canada, too.

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