GPON网络中，同个PON口下两个ONU设备的最大物理距离差为（）。

网络认证技术只是单向认证技术

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.

EPON和GPON具有相同的（），不同的（）。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

EPON的各个ONU/ONT可以动态使用上行带宽。

EPON网络中，ONU发光最大平均发送光功率是多少？（）

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。