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單項(xiàng)選擇題

Lubricating oil systems are fitted with a wide variety of strainers some of which can be cleaned in site while others have replaceable cartridgesThe bold and italic word “which” means （）.

A.lubricating oil
B.lubricating oil systems
C.strainers
D.cartridges

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單項(xiàng)選擇題

In many installations basket strainers consist of a cylindrical container in which a perforated metal or wire basket is suspendedThe bold and italic word “which” means （）.

A.installations
B.basket strainers
C.a cylindrical container
D.a metal or wire basket

單項(xiàng)選擇題

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

A.dampers
B.filters
C.stopper circuits
D.separators

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