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【多选题】
下列对于两刚片规则说法正确的是A.
一铰一约束两个无多余约束的刚片组成几何不变体系
B.
一铰一约束两个无多余约束的刚片，且不通过该铰，这样的体系称为几何不变体系
C.
两个无多余约束的刚片用三根不平行的连接组成的体系称为几何不变体系
D.
两个无多余约束的刚片用两根平行及一根不平行连接组成的体系称为几何不变体系
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