单项选择题
A.蓝色 B.黑色 C.金色 D.银白色
A.+2.0DS/+1.0DC×180 B.-1.0DS/+3.0DC×180 C.+1.0DC×180/+3.0DC×90 D.+1.0DC×90/+3.0DC×180
A.-3.0DS/+2.0DC×90 B.+1.0DS/+2.0DC×180 C.-1.0DS/+3.0DC×180 D.+1.0DS/+2.0DC×90