Commercial available medium size machines have a speed range of __________ ?
(A) 200 to 400 r.p.m
(B) 600 to 1000 r.p.m
(C) 1000 to 1500 r.p.m
(D) 2000 to 2500 r.p.m
Commercial available medium size machines have a speed range of __________ ?
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