用触发器组成12进制数计数器，至少应用触发器的个数为（）个。

DML触发器分为（）触发器、（）触发器和（）触发器三类。触发器的三个要素：（）。

触发器事件和语句是SQL语句、数据库事件、用户事件，导致触发器触发。触发器时机可以是（）。

口服补液及时纠正脱水，应用ORS，说法正确的是（）

触发器的对象既可以选择图片，还可以选择文字。

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。