A . A、起始端标签TO,T3-10F,终止端标签FROM,PS2-9FB . B、起始端标签FROM,T3-10F,终止端标签TO,PS2-9FC . C、起始端标签TO,PS3-10F,终止端标签FROM,T2-9FD . D、起始端标签TO,T3-9F,终止端标签FROM,PS2-10F
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