A. 无多余约束的几何不变体系 B. 有多余约束的几何不变体系 C. 有多余约束的几何可变体系 D. 常变体系
A. 无多余约束的几何不变体系 B. 缺少约束的几何可变体系 C. 有多余约束的几何不变体系 D. 常变体系
A. 对 B. 错
A host of City Centre Talk. B. An employee at the City Centre. C. An ordinary person who did something great. D. An amazing nurse who saved a patient's life.