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有这样几个题目: 1.将三块砖如图所示放在水平桌面上,则它们对桌面的压强( )(A)平放最大(B)侧放最大(C)立放最大(D)一样大·42·2.三个高度相同,分别用铅、铜和铝做成的圆柱体,竖直放置在水平桌面上,对桌面的压强是(p铅=11.3×10(3)kg/m3,p铜=8.9×10(3)kg/m3,P铝=2.7×10(3)kg/m3) (A)铅圆柱体最大(B)铜圆柱体最大(C)铝圆柱体最大(D)一样大3.长方体花岗岩(P=2.5×10(3)kg/m3)三
There are several problems: 1. Place the three bricks on the horizontal table as shown in the figure, then their pressure on the desktop () (A) flat maximum (B) side maximum (C) vertical maximum (D ) The same size, 42·2. Three cylinders of the same height, made of lead, copper and aluminum, respectively, are placed vertically on a horizontal tabletop. The pressure on the table is (p lead = 11.3 × 10 (3) kg. /m3,p Copper = 8.9 x 10(3) kg/m3, P aluminum = 2.7 x 10(3) kg/m3) (A) Lead cylinder Max (B) Copper cylinder Max (C) Aluminum cylinder Max (D) as large as 3. cuboid granite (P=2.5×10(3) kg/m3) three