7.用长、宽、高分别为3、4、6的长方体削出一个最大的圆柱,则圆柱的体积是( )
| A. | 28.26 | B. | 37.68 | C. | 42.39 | D. | 43.54 |
6.分母为5的最接近$\frac{3}{4}$的分数为( )
0 297716 297724 297730 297734 297740 297742 297746 297752 297754 297760 297766 297770 297772 297776 297782 297784 297790 297794 297796 297800 297802 297806 297808 297810 297811 297812 297814 297815 297816 297818 297820 297824 297826 297830 297832 297836 297842 297844 297850 297854 297856 297860 297866 297872 297874 297880 297884 297886 297892 297896 297902 297910 366461
| A. | $\frac{2}{5}$ | B. | $\frac{3}{5}$ | C. | $\frac{4}{5}$ | D. | $\frac{1}{5}$ |