大地水准面和铅垂线是大地测量作业的基准面和基准线。（）

测量计算的基准面是大地水准面。

测量工作的基准面是大地水准面。

正高系统是以大地水准面为基准面的（）。某点的正高是该点到通过该点的铅垂线与大地水准面的交点之间的距离。

在实际工作中，参考椭球面是测量内业计算的基准面，大地水准面是测量外业工作的基准面。

什么是水准面、大地水准面？大地水准面有何特性？

测量工作中所用的高程就是以大地水准面为零点起算。La5B3016、高程测量方法主要有水准测量和三角高程测量。

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。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。