单项选择题
A.-5.50DS/-2.50DCX30B.-5.50DS/+2.50DCX30C.-5.50DS/+2.50DCX120D.-5.50DS/-2.50DCX120
A.+2.50DS/-1.00DCX110B.+2.50DS/-1.00DCX20C.+3.50DS/-1.00DCX20D.+3.50DS/-1.00DCX110
A.+1.50DCX60/-0.50DCX150B.+1.50DCX150/-0.50DCX60C.+1.50DCX60/+0.50DCX150D.+1.50DCX150/+0.50DCX60