43. 當鑽不鏽鋼白鐵件時，其鑽頭角度及轉速控制為何？


(A) 90 degrees and turn at a low speed.
(B) 118 degrees and turn at a high speed.
(C) 140 degrees and turn at a low speed.
(D) 130 degrees and turn at a high speed.

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