哪些客户渠道是无利可图的？
对于无利可图的客户渠道，也把它们掐断了。[{'character': '对', 'pinyin': 'duei4', 'highest pitch': 10.34, 'lowest pitch': 8.44, 'duration': 0.25, 'prosody hierarchy': 'null'}, {'character': '于', 'pinyin': 'v2', 'highest pitch': 9.52, 'lowest pitch': 8.42, 'duration': 0.21, 'prosody hierarchy': '#2'}, {'character': '无', 'pinyin': 'u2', 'highest pitch': 10.34, 'lowest pitch': 8.35, 'duration': 0.15, 'prosody hierarchy': 'null'}, {'character': '利', 'pinyin': 'li4', 'highest pitch': 11.09, 'lowest pitch': 9.11, 'duration': 0.17, 'prosody hierarchy': 'null'}, {'character': '可', 'pinyin': 'ke3', 'highest pitch': 13.53, 'lowest pitch': 7.66, 'duration': 0.2, 'prosody hierarchy': 'null'}, {'character': '图', 'pinyin': 'tu2', 'highest pitch': 6.17, 'lowest pitch': 5.69, 'duration': 0.21, 'prosody hierarchy': 'null'}, {'character': '的', 'pinyin': 'de5', 'highest pitch': 8.87, 'lowest pitch': 7.58, 'duration': 0.16, 'prosody hierarchy': '#2'}, {'character': '客', 'pinyin': 'ke4', 'highest pitch': 10.77, 'lowest pitch': 9.56, 'duration': 0.21, 'prosody hierarchy': 'null'}, {'character': '户', 'pinyin': 'hu4', 'highest pitch': 13.61, 'lowest pitch': 8.33, 'duration': 0.18, 'prosody hierarchy': '#1'}, {'character': '渠', 'pinyin': 'qv2', 'highest pitch': 8.33, 'lowest pitch': 5.15, 'duration': 0.22, 'prosody hierarchy': 'null'}, {'character': '道', 'pinyin': 'dao4', 'highest pitch': 7.12, 'lowest pitch': 5.31, 'duration': 0.22, 'prosody hierarchy': '#3'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.12}, {'character': '也', 'pinyin': 'ie2', 'highest pitch': 10.59, 'lowest pitch': 7.54, 'duration': 0.18, 'prosody hierarchy': 'null'}, {'character': '把', 'pinyin': 'ba3', 'highest pitch': 6.83, 'lowest pitch': 6.56, 'duration': 0.18, 'prosody hierarchy': '#1'}, {'character': '它', 'pinyin': 'ta1', 'highest pitch': 7.69, 'lowest pitch': 6.56, 'duration': 0.15, 'prosody hierarchy': 'null'}, {'character': '们', 'pinyin': 'men5', 'highest pitch': 7.23, 'lowest pitch': 6.66, 'duration': 0.14, 'prosody hierarchy': '#1'}, {'character': '掐', 'pinyin': 'qia1', 'highest pitch': 8.18, 'lowest pitch': 6.66, 'duration': 0.26, 'prosody hierarchy': 'null'}, {'character': '断', 'pinyin': 'duan4', 'highest pitch': 8.08, 'lowest pitch': 5.85, 'duration': 0.23, 'prosody hierarchy': 'null'}, {'character': '了', 'pinyin': 'le5', 'highest pitch': 5.85, 'lowest pitch': 4.52, 'duration': 0.17, 'prosody hierarchy': '#4'}]