普通话元音韵尾主要由i、u、o三个音素充当。

普通话韵母的主要成分是____，其结构可以分为韵头、韵腹、韵尾三个部分。

韵母也可以按韵尾的情况进行分类，按照这个分类标准可以分为无韵尾韵母、元音韵尾韵母和鼻音韵尾韵母三类。

构成韵头的元音可以是ɑ、o、e，也可以是i、u、û。

当前一音节收尾音素是—i（舌尖后特殊元音）时，如“你吃啊”时，“啊”读作：（）

韵头都由高元音（）充当。元音韵尾由（）充当，辅音韵尾由（）充当。

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.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

元音i[i]与u[u]的区别主要在于舌位的高低不同。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。