A、应靠近主节点,偏离主节点的距离不应大于600mm

B、应靠近主节点,偏离主节点的距离不应大于300mm

C、应远离主节点,偏离主节点的距离不应小于400mm

D、应远离主节点,偏离主节点的距离不应小于600mm

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