A device fitted over the discharge opening on a relief valve consisting of one or two woven wire fabrics is called a（）.

A heavy steel curved arch constructed athwartships and above the after deck on a towing vessel is sometimes called a（）.

A （）, sometimes called filters, is a device designed to prevent the passage of unwanted solids into the system.

Strainers, sometimes called （）, are devices designed to prevent the passage of unwanted solids into or further along a system.

Oil is supplied to the crosshead using a swinging arm or a （） and is sometimes boosted in pressure to and efficient lubrication.

（）sometimes called filter, is a device designed to prevent the passage of unwanted solids into the system.

A carburetor is required to have a safety device called a(n)（）.

A公司与B公司签订《船舶转让协议》，约定A公司将船舶转让给B公司，转让价格为XX万元B公司交押金X万元，以后每月支付船价及利息X万元，如两个月内不付转让费，A公司有权收回船舶由B公司负责办理船舶营运手续B公司中途无故退回船舶，已付的转让费不再退回，等等。B公司经营船舶一年后，以A公司提供的船舶陈旧，操纵性能差等为由，向A公司提出终止船舶转让协议。A公司欲协商，但协商不成，A公司收回船舶国籍证书，船舶技术证书及营运证书。该协议属海商法范围内的何种合同？该协议是否有效

In astern towing，a tow span，also called the tow bar or towing arch，is used to（）.

A current moving across a lock entrance toward the river or toward the dam is called a(n)（）.

An entry of water，gas，oil，or other formation fluid into the wellbore is called a（）.

被保险船舶从A港开航后驶向C港，原定中途停靠B港。船舶在A港至B港的单独航程中遭遇飓风袭击，折断桅杆随后船舶在航行中又遇上台风，造成船体其他部位受损，保险人对于免赔额的处理是（）。