单项选择题
A...1 0 0 0 0 0 0 0 0 1 1 1 0...... B.+1 -1 0 0 -1 +1 0 0 +1 -1 +1 -1 0...... C.+1 0 0 0 0 0 0 0 0-1 +1 -1......
A.HDB3 B.AM1 C.RZ
A.9uF B.3uF C.2uF