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【单选题】
3-13 某一差动液压缸如下图所示,差动联结快进行程,右图为快退行程,求在( 1 ) v 3 = v 2 和( 2 ) v 3 =2 v 2 两种条件下活塞面积 A 1 和活塞杆面积 A 2 之比。A.
（1）1:1 （2）3:1
B.
（1）2:1 （2）3:1
C.
（1）3:1 （2）1:1
D.
（1）2:1 （2）4:1
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