在n个结点的元向图中，若边数在于n-1，则该图必是连通图。

对于那些所有非叶子结点均含有左右子数的二叉树： （1）试问：有n个叶子结点的树中共有多少个结点？ （2）试证明： ，其中n为叶子结点的个数，表示第l _i个叶子结点所在的层次（设根节点所在层次为1）。

一棵哈夫曼树有n个叶子结点（终端结点），该树总共有（）个结点。

Every deliberate act of wrongdoing by the master or any of the crew against the ship or cargo，without the authorization or privity of the Shipowner or his agent，is（）.

（）, or drum is used for hauling in or letting out the wires or ropes which will fasten the ship to the shore.

A salvor may be（）the whole or part of the payment due under Salvage Convention to the extent that the salvage operations have become necessary or more difficult because of fault or neglect on his part or if the salvor has been guilty of fraud or other dishonest conduct.

The （） is used for hauling in or letting out the wires or ropes.

Vessels must be（）valid certificate of nationality or certificated of registry or license.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

在具有200个结点的树中，其边的数目为(118)。

在具有100个结点的树中，其边的数目为______。