單項選擇題

______ is a book or brochure giving information about how to do sth

A、A manual
B、A memorandum
C、A schematic
D、A prop

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單項選擇題

調(diào)車機在掛車時，應預先檢查該線路所設置防護信號已撤除后方準作業(yè)（）

A.到發(fā)線
B．裝卸線
C．修車線
D．調(diào)車線

單項選擇題

The specific role of liver in lipid metabolism is

A、converts glucose into fat
B、converts cholesterol into bile acids
C、oxidation of fatty acids
D、synthesis of phospholipids
E、synthesis of cholesterol

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