在水平角观测时，经纬仪瞄准花杆读数时，应照准在（）。

在水平角观测工作中，经纬仪瞄准花杆时，应当瞄准花杆的（）。

冰期水位观测，应观测河道、水库（湖泊）等水体的（）的水位。

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。

黄河下游坝岸拆改一般拆到设计根石顶以下0.5～1.Om，或设计（）以下0.5～1.Om。

延长已知直线时，可在直线上两点分别竖立标杆，通过两标杆目测或拉直线确定出（）第三根标杆。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。