什么是边界层？边界层有什么特征？

电气边界（禁止布线层）用于限制元件布置及铜膜走线在此范围内

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.

清水灭火器的使用通常按（）、另一手托住灭火器的底圈、与地面保持垂直状态、将射流对准燃烧处喷射的方法步骤进行。

边界层厚度与雷诺数Re的（）成反比。雷诺数愈大，边界层厚度越薄.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

流体流过静止的平板时将形成边界层，其由层流边界层发展成湍流边界层需要流过的长度（）。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。