18.压路机前轮转动一周,求压过的面积是多少,这是求圆柱的( )
| A. | 侧面积 | B. | 表面积 | C. | 体积 |
11.点$(0,-\sqrt{2})$所在的位置是( )
0 297785 297793 297799 297803 297809 297811 297815 297821 297823 297829 297835 297839 297841 297845 297851 297853 297859 297863 297865 297869 297871 297875 297877 297879 297880 297881 297883 297884 297885 297887 297889 297893 297895 297899 297901 297905 297911 297913 297919 297923 297925 297929 297935 297941 297943 297949 297953 297955 297961 297965 297971 297979 366461
| A. | x轴正半轴 | B. | x轴负半轴 | C. | y轴正半轴 | D. | y轴负半轴 |