The guard, fencing or shielding for moving parts or machinery can be removed for repair only when the machinery it belongs to（）

Each cover consists of two or （）panels.

Each （）consists of two or more panels.

The goal, which they are unlikely to live to see , is tocure, prevent or manage all diseasesin the next 80or so years.

（）uses one or two high pressure pumps for all the cylinders with one more standby, while（）have a separate high-pressure pump for each cylinder.

什么是语法范畴？英语中语法范畴有哪些？用哪些语法手段来表示？

If necessary to avoid collision or allow more time to（）the situation，a vessel shall slacken her speed or take all way off by stopping or reversing her means of propulsion．

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.

When loading or discharging dry mud or cement，crew members should use goggles and（）.

They cannot be brother, __________they do not resemble each other at all.

After the cameraman had taken three or four photographs of the soldier ants, he found they had ______ all over his feet.