Dry powdery solid materials are transported by a __________ conveyor.

Dry powdery solid materials are transported by a __________ c

1.	Dry powdery solid materials are transported by a __________ conveyor.
A.	belt
B.	bucket
C.	screw
D.	none of these
Answer» D. none of these

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Dry powdery solid materials are transported by a __________ conveyor.

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