【单选题】X服从0-1 分布,有P(x=1)=p=0.6 ,从中取出样本 。则 = ( ) 。
【简答题】水库溢洪道宽度越大,最大下泄流量越( ),防洪库容越( )。
【简答题】水库溢洪道宽度越大,最大下泄流量( ),防洪库容( )。
【单选题】You have a use case in your web application that adds several session-scoped attributes. At the end of theuse case, one of these objects, the manager attribute, is removed and then it needs to decide ...
A.
The object of the manager attribute should implement the HttpSessionBindingListener and it should call the removeAttribute method on the appropriate session attributes.
B.
The object of the manager attribute should implement the HttpSessionListener and it should call the removeAttribute method on the appropriate session attributes.
C.
The object of the manager attribute should implement the HttpSessionBindingListener and it should call the deleteAttribute method on the appropriate session attributes.
D.
The object of the manager attribute should implement the HttpSessionListener and it should call the deleteAttribute method on the appropriate session attributes.
【简答题】对于一个m行n列的稀疏矩阵中有len个非零元素,则用十字链表存储时,需要( )个头指针。