A.+1.25D B.+1.75D C.+2.25D D.+2.75D
A.+1.25D B.+1.75D C.+2.50D D.+3.00D
A.避免集合力加速衰退 B.避免調(diào)節(jié)力加速衰退 C.避免產(chǎn)生內(nèi)隱斜 D.避免產(chǎn)生外隱斜