block signal A: a fixed signal that lets engineers know if a train can enter a block. B: a conductive connector used to maintain circuit continuity for track circuits and electrified tracks.
block signal A: a fixed signal that lets engineers know if a train can enter a block. B: a conductive connector used to maintain circuit continuity for track circuits and electrified tracks.
He had all the fences around his home______ . 未知类型：{'label': 'questionDesc', 'content': '根据句意，选择合适的单词或短语', 'isMemberControl': 0, 'type': 181} 未知类型：{'label': 'source', 'content': '英语二2018年完型', 'isMemberControl': 0, 'type': 181} A: discussed B: electrified C: refused D: regretted
He had all the fences around his home______ . 未知类型：{'label': 'questionDesc', 'content': '根据句意，选择合适的单词或短语', 'isMemberControl': 0, 'type': 181} 未知类型：{'label': 'source', 'content': '英语二2018年完型', 'isMemberControl': 0, 'type': 181} A: discussed B: electrified C: refused D: regretted
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