在进行GPS RTK测量时，参考站不需要（）。

GPS RTK是全球定位系统的实时动态定位测量

全球定位系统实时动态测量（GPS-RTK测量）宜采用的时间系统是（）。

GPS RTK可达到（）精度。

RTK技术的关键在于数据处理技术和数据传输技术，需注意的是：RTK技术的观测精度为（ ）级

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。