排球基本技术中最难掌握的技术，并且在排球比赛中最积极、最有效的进攻手段是（）。

下面哪项技术不属于排球基本技术（）。

沙滩排球诞生于20世纪20年代（）；软式排球20世纪80年代（）

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。

排球扣球动作技术结构中的关键环节是( ）

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

排球发球技术从站位方式来区分有正面发球、（）。