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paracrine signaling (旁分泌信号)
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单选题（）表示以该信号机为始端的进路设置了自动进路。A
信号机旁显示黄色三角B
信号机旁显示绿色箭头C
信号机旁显示绿色三角D
信号机旁显示黄色箭头
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