当输入杆在5毫米到10毫米之间时，测量活塞的伸长。
A.When the movement of input rod is ranged from 5 tolO mm, measure the piston retraction. B.4 When the input lever is between 5 and 10 mm, measure the piston extension. C.When the interval of input shaft changes between 5 and 10 mm, measure the expansion of the piston.正确答案B
