（）, 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.

斜管（板）沉淀池按其水流方向可以分为（）三种。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

上向流斜管沉淀池tube settler

斜管沉淀池中，当斜管倾角为60度时，斜管内的流速为（）

异向流斜管沉淀池，斜管倾角为（ ）。

斜管沉淀池中，斜管的倾角越小，沉淀面积越大，沉淀效果越高，但对排泥不利，生产实践中倾角宜在（）

关于斜管沉淀池说法不正确的是（）

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。