at the time, a pack of, help out, in the meantime, be terrified of, yell out, sort out, ahead of, aim at, in time
某城镇周围的农民要发展小麦、果林、乳牛、渔业、蔬菜等农业生产,请在下图中A、B、C、D、E处合理安排,并说一说你的理由。
已知点M(a,b)在圆Ox2+y2=1外,则直线ax+by=1与圆O的位置关系是( )