采用超声波法现场测试混凝土强度时，相对两测点的距离即为超声的传播路径长度，此长度与实际距离的误差应不超过（）

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。

光缆线路特性测试，衰减测试常用的方法有：（）

什么叫带电测试？目前线路常用带电测试项目有哪些？

斜坡堤混凝土护面块体种类较多，常用的块体有（）等，必须根据块体的形状特征，选择其预制成型方式和制作方式。

常用的材料采购分工方式有（）。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。