A.+0.118V B.+1.20V C.+0.07V D.-0.50V

A.+0.118V B.+1.20V C.+0.07V D.-0.50V

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A、d=80mm B、d=40mm C、d=20mm D、d=5mm

A、d=80mm B、d=40mm C、d=20mm D、d=5mm

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