A.≥45 B.≥50 C.≥60 D.≥70
A.1dB或2dB B.10-40dB C.20-40dB D.30-40dB
A.1.41µm,1.65µm B.1.31µm,1.55µm C.1.11µm,1.25µm D.1.31µm,1.75µm