各项不为零的等差数列{a n }中,2a 4 -a 7 2 +2a 10 =0,则a 7 的值为 [ ]
A.
0
B.
4
C.
0或4
D.
2
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【单选题】Guiyang Customs and Scenery Competition Notice Fifteen questions for the Guiyang Customs and Scenery Competition were published in China Daily on May 5 and 7, and on China Daily's web edition on May 7...
【单选题】Guiyang Customs and Scenery Competition Notice Fifteen questions for the Guigyang Customs and Scenery Competition were published in China Daily on May 5 and 7, and on China Daily's web edition on May ...