【简答题】初值问题 的特解为 y=(1/2 A+B )^D. 则A= ( ), B=( ), D=().
【单选题】世界上面积最大的洲和最小的洲以及面积最大的岛屿是 [ ]
【单选题】The helicopter could not land because ______.
A.
the mountain was too high
B.
the mountain sides were too steep
C.
the runway was too narrow
D.
the weather was very bad
【简答题】对可分离变量方程的初值问题求特解时,可以采用定积分方法吗?
【多选题】共线条件方程是以数学形式表达了()之间的共线关系。