When the cube A and cube B are placed on the horizontal table, their pressure on the table is equal, and the ratio of pressure is 9:4, then the ratio of density of cube A and cube B is () A. 2：3B. 3：2C. 1：1D. 4：9

F1s1 = f2s2 ﹣ F1F2 = S1S2 = 94 ﹣ L1L2 = 32 ﹣ V1V2 = 278, F1F2 = m1m2 = 94 ﹣ ρ 1 ρ 2 = m1v1m2v2 = 92748 = 23

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