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在斜导柱侧向分型抽芯机构中,锁紧块的斜角α′与斜导柱的倾角α之间的正确关系式是()。
A . A、α=α′+2~3
B . B、α=α′-2~3°
C . C、α-α′<25°
D . D、α′-α≤25°
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