【单选题】八皇后问题中,假设第i、j(i≠j)行的皇后分别摆放在xi、xj列,判定它们摆放位置有效的公式是______。
【单选题】物流成本中最大的单项成本是( ),因此是物流系统设计和管理的关键环节
【单选题】10105
A.
The captain is Brazilian.
B.
The captain is Canadian.
C.
The captain is American.
D.
The captain is Australian.
【单选题】某同学以myname为其用户名在新浪网注册的电子邮箱地址,其邮箱名一般为______。
【单选题】10105 Question:
A.
The second speaker is lucky.
B.
The first speaker has been promoted.
C.
The second speaker feels happy about the first speaker's promotion.
D.
The second speaker has been promoted.
【单选题】下列各种滤波器的结构中哪种不是FIR滤波器的基本结构( )。