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（）.

Effects which are dutiable or subject to prohibitions or restrictions should be declared in （）.

根据《通信电源设备安装工程施工监理暂行规定》，关于竣工验收，以下说法正确的是（）

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

关于功率控制，以下说法正确的是（）.；

关于开环功率控制，以下说法正确的是（）

关于功率控制，以下说法错误的是____

关于功率控制，以下说法错误的是（）。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。