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（）

求压杆临界力的欧拉公式适用于下面四种情况的（）。

试述压杆稳定的欧拉公式普遍形式是什么？符号的意义是什么？

已知压杆材料的比例极限σ_p、屈服极限σ_s，欧拉临界压力（临界应力）公式的适用条件是（）。

Keyboard Error or no keyboard present.表示哪个配件有问题（）

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。