测量竖直角与测量水平角有何不同？观测竖直角时竖盘指标水准管的气泡为何一定要居中？

测量竖直角与测量水平角有何不同？ 观测竖直角时竖盘指标水准管的气泡为何一定要居中？ 

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（）.

水平角是通过目标的方向线投影在水平面内所形成的夹角，有仰角和俯角之分。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

三端固定输出稳压器是指电压输入、电压输出和（）三端。此类稳压器输出电压有正、负之分。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。