当所有观测值都落在回归直线上，则两个变量之间的相关系数为( )。

统计学上，用相关系数来定量描述两个变量之间的直线性相关的（）。

相关关系指的是观测点与回归直线间的聚散程度，而回归关系则为回归直线的（）

当直角的一边平行某投影面时，则这两直线在该投影面的投影是（）。

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。

多元线性回归中，当方程中纳入无统计学意义的变量会导致（）。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。