【判断题】The greedy process is a step-by-step procedure.
【单选题】设A={x|x>0},B={x|x<1},则A∩B= [ ]
【单选题】设方程2 -x =|lgx|的两个根为x 1 ,x 2 ,则( )
【单选题】Which of the following is incorrect in this greedy process?
A.
update all nodes with the cost of all links everytime
B.
always pick the node with the smallest estimated distance
C.
always pick the link with the smallest cost
D.
none of the options given
【单选题】自动闭塞进站信号机接近区段一般是 ( )
【单选题】设A={x|x≥1},U=R,求C u A=( )
【单选题】设方程3 x =|lg(-x)|的两个根为x 1 ,x 2 ,则 [ ]
【单选题】设A={x|x≥1},U=R,则C U A= [ ]
【简答题】自动闭塞进站信号机接近区段一般是 ( )A. 1200-1500m; B)800-1200m; C)600-800m.
【单选题】设x 1 ,x 2 ,x 3 ,x 4 ,x 5 这五个数的平均数是a,则x 1 -1,x 2 -1,x 3 -1,x 4 -1,x 5 -1的平均数是( )