设函数y＝f（x）具有二阶导数，且f′（x）＝f（π/2－x），则该函数满足的微分方程为（　　）。

设函数y＝f（x）具有二阶导数，且f′（x）＝f（π/2－x），则该函数满足的微分方程为（　　）。

由x2－xy＋y2＝C确定的隐函数满足的微分方程是（　　）。

由x2-xy+y2=C确定的隐函数满足的微分方程是（　　）.

口服补液及时纠正脱水，应用ORS，说法正确的是（）

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.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

应用能量方程时应满足什么条件？ 

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

淮南师范学院大学生创业教育工作的官方网址是（）。