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
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Strainers, sometimes called （）, are devices designed to prevent the passage of unwanted solids into or further along a system.
A.dampers
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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
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单项选择题
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A.stop valves
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C.quick closing valves
D.relief valves
