华东理工大学网络教育实行的是弹性学制，高起专和专升本两种层次的学习年限均是（）

起重机械中常用的钢丝绳是（）。

起重机械中常用的钢丝绳是（　）。

起重机械广泛使用的钢丝绳是（　）。

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。

起重机械作业前，必须执行钢丝绳及吊带的（），严禁驾驶故障的起重机械。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。