单选题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 （）.Alubricating oilBlubricating oil systemsCstrainersDcartridges
单选题
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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