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【单选题】
X6132 型万能铣床主轴上刀制动时,把( )打到接通位置, SA2 — 1 断开 127V 控制电源,主轴刹车离合器 YC1 得电,主轴不能启动。A.
SA1 — 1
B.
SA1 — 2
C.
SA2 — 3
D.
SA2 — 2
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