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当前学科：装配钳工中级考试
题目：
单选
常用的松键联结有（）联结两种。
A . A、导向平健和钩头楔键
B . B、普通平健和普通楔键
C . C、滑键和切向键
D . D、平健和半圆健
E . E、楔键和切向健
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