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The diaphragm moulding machine is used to

A. Ram the sand harder at the pattern face with decreasing hardness towards the back of the mould

B. Ram the sand harder at the back of the mould and softer on the pattern face

C. Produce uniform packing of sand in the mould

D. Give uniform sand hardness throughout the mould

Please do not use chat terms. Example: avoid using "grt" instead of "great".

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