（）是每个验光员必备的学习态度。

梅文鼎有哪些科技成就？

单轨吊车应装备（）、（）等安全保护装置；制动力符合有关规定。

攀岩运动按攀登形式分类可分为自由攀登、器械攀登和（）。

继电保护装置是保证电力元件安全运行的基本装备,任何电力元件不得在无保护的状态下运行

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.

（）的态度是每个验光员应必备的。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

攀岩保护中连接固定点或软性连接时使用（）。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。