在双打比赛中，每次换发球时，前面的接发球员应成为发球员，前面的发球员的同伴应成为接发球员。

发球员和接发球员都必须站在斜对角发球区内发球和接发球。

在他动身前往北京开会之前，已经准备好了一份很有分量的发言材料。

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。

球员做好击球准备后，如果球发生移动要加罚两杆

期末考试来临，某校老师决定将音乐、体育、美术提前一个月进行考试，把语文、数学、外语放在期末考试期间考，这种做法（　　）。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。