操作技能考试按考试条件可以分为（）几种。

操作技能考核试题的基本内容包括准备标准、考核要求、区分与评分标准。

简谐振动三要素是频率、（）、初相位。

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。

加油站经理认证考核（试）包括理论知识考试和实操技能考核。其中理论知识考试（）分以上为合格，实操技能考核（）。

在机械振动最简单最基本的简谐振动中，振动周期的倒数称为振动频率，单位为（）。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。