单项选择题
A.2~60sB.2~120sC.2~180sD.2~300s
A.1个B.2个C.3个D.4个
A.2.5inB.3.0inC.3.5inD.4.5in
A.脉冲发生器本体B.定子C.上轴承套D.下轴承套
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