m阶B树的根结点若不是叶结点，那么它至多有m棵子树，至少有 【7】 棵子树。
参考答案：B
——Could you tell me ?
——Glad to help.
A．if I have been to the Great Wall
B．where did he study
C．how I can get to the post office
D．what’s your name
根据背景材料所述，计算期内甲方的合计净现金流量为( )万元。
A．1600
B．1400
C．200
D．0
