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  3. All faces of the solid above are rectangular. Column A Column B The length of diagonal MN

All faces of the solid above are rectangular. Column A Column B The length of diagonal MN

admin2009-05-19  56
问题
All faces of the solid above are rectangular.

Column A                            Column B
The length of diagonal MN           15
选项 A、if the quantity in Column A is greater
B、if the quantity in Column B is greater
C、if the two quantity are equal
D、if the relationship cannot be determined from the information given
答案A
解析 图中物体的所有的面都是矩形。
解：本题的正确答案为(A)。由图中所给的条件可知，该物体是一个长方体，三条相交的边相互垂直。所以对角绒(diagonal)MN等于任意三条相交的边的平方和，即：MN2 =(62+82)+122=244>225=152
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