简述透射电子显微镜、扫描电子显微镜、扫描隧道显微镜和原子力显微镜的工作原理

扫描电子显微镜景深长，成像具有较强的立体感，可用于观察核孔复合体等精细结构。

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（）.

双扫描示波器有两套扫描系统：A扫描系统用于观测（）；B扫描系统用于观测信号中的给定部分，并以快速扫描展宽该处的信号。

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。

三极管广泛用于各种电子控制装置中，可用于信号放大和作无触点电子开关。