一般为每个弯钩一条延伸板一块固定板，但固定板可相间减少。
Generally, each bent hook is matched with one extending plate and one fixed plate, but the fixed plates can be decreased in an interphase mode.
一般为每个弯钩一条延伸板一块固定板，但固定板可相间减少。
Generally, each bent hook is matched with one extending plate and one fixed plate, but the fixed plates can be decreased in an interphase mode.
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