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单项选择题

Among the following statement about jx-300xp DCS network system,  (         ) is wrong.
A、SBUS is the lowest level network
B、SUB-S2 is located between the I/O cages governed by the control station
C、Process control network Scnet II is a dual high speed redundant industrial network
D、SBUS-S1 network connection master business card printing and data forwarding card

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