A vessel or object being towed astern shall display a(n)（）.

The movement of water away from the shore or downstream is called a(n)（）.

烽火设备单板在正常状态下，单板的运行灯和告警灯的状态是（）

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.

When loading or discharging dry mud or cement，crew members should use goggles and（）.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

OLT是PON系统的局端设备，ONU\ONT是PON系统的用户侧设备。（）

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。