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某有机物分子式为CaHbOcNd,则氢原子数目b最多为
A.2a + d + 2 B.2a + 2d + 2 C.2a + c + d D.2a + c + 2
A.2a + d + 2 B.2a + 2d + 2 C.2a + c +d D.2a + c + 2