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【单选题】
在斜导柱侧向分型抽芯机构中,锁紧块的角度α′该与斜导柱的倾角α的关系为。 ( )A.
α = α′ +2~3 °
B.
α = α′ -2~3 °
C.
α = α′ +10~15 °
D.
α = α′ -10~15 °
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