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In a pneumatic bellows | |
A. | the input surface, output surface and side walls are corrugated [Wrong Answer] |
B. | the input surface and output surface are flat but the side walls are corrugated [Correct Answer] |
C. | the input surface and side walls are flat but the output surface is corrugated [Wrong Answer] |
D. | the input surface and output surface are corrugated but the side walls are flat [Wrong Answer] |