A、A350~400mm
B、B400~450mm
C、C450~500mm
D、D500~550mm
答案:B
A. A1/R,1/R
B. B1/R,0
C. CO,1/R
D. D0,0
A. A5600mm
B. B5700mm
C. C5800mm
D. D5900mm