简述什么是一级相变、二级相变、均匀相变、非均匀相变及其特征。

二级相变，在相变点两相的化学势和化学势的（）连续，但化学势的二级偏导数 存在突变。

简述二级相变的定义及其特征并举例。

何谓均匀成核？何谓不均匀成核？晶核剂对熔体结晶过程的临界晶核半径r*有何影响？

在相同条件下，非均匀成核与均匀成核比较，非均匀成核（）。

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。