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第Ⅰ卷 (选择题 共 32分 ) 一、单选题 (共 2 0分 ,每小题 2分 )1.甲、乙两个正方体放在水平桌面上 ,它们对桌面的压强相等 ,压力之比为 9∶4 .则甲、乙的密度之比是 ( ) .(A) 2∶3 (B) 3∶2 (C) 1∶1 (D) 4∶92 .关于力和运动 ,下面说法正确的是 ( )
Volume I (multiple choice questions totaling 32 points) I. Multiple choice questions (20 points in total, 2 points for each question) 1. Two cubes A and B are placed on a horizontal tabletop. Their pressure on the desktop is equal and pressure is on them. The ratio of A to B is 9:4. Then the ratio of the density of A and B is (). (A) 2:3 (B) 3:2 (C) 1:1 (D) 4:92 . About force and movement, the following statement the correct one is( )