单项选择题
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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相关考题
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单项选择题
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 -
单项选择题
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 -
单项选择题
A(n) （） is a special type of valve which prevents the passage of steam but allows condensate to pass.
A.check valve
B.non-return valve
C.steam trap
D.quick closing trap
