= ．相关试题
表示的曲线是___________________。Let a and 
be the length of two sides of a rectangle (矩形)，rotate(旋转)the rectangle about its
diagonal(对角线)，then the volume(体积) of the revolution(旋转休) obtained is equal to________。
图2是正方体的展开图，其中直线AB与CD在原正方体中的成角的大小是_______。
(
-Log
<-
的解集是_______。推荐套卷
Let a and be the length of two sides of a rectangle (矩形)，rotate(旋转)the rectangle about its
diagonal(对角线)，then the volume(体积) of the revolution(旋转休) obtained is equal to________。
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