54. The rotation speed of the drill bit with larger diameter should be
(A) higher
(B) lower
(C) irrelevant
(D) high or low 

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統計: A(9), B(33), C(2), D(3), E(0) #2929631

詳解 (共 1 筆)

#5498526
鑽頭越粗,轉速要越慢公式 V=(pi*D...
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