插削内花键时,工件孔中心与工作台中心不重合,不会造成内花键大、小径同轴度超差()
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In the 1960s Pop music underwent a revolution when the Beatles became world famous and turned their hometown of()into a place of pilgrimage.
A. Manchester
Blackpool
C. Liverpool
D. Sheffield
何者不属于常见的折扣手法?()
A. 现金折扣
B. 折让
C. 折损
D. 数量折扣
JW1200/60型无级绳车电动机轴承应注()
A. 钠基脂
B. 钙基脂
C. 锂基脂
D. 润滑脂