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【简答题】
There are three main components to an ABS system: wheel speed sensors, electronic control unit and hydraulic modulator.
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【简答题】Apparently，we are safe neither at home nor in the business office．We use water in both places，but the research shows that chemicals added to our local water supply to kill harmful bacteria can have un...
【单选题】Intelligent use of the muscles means that ________．
A.
one always knows what his muscles are doing
B.
one performs simple actions whithout working
C.
one’s muscles are used only to the extent necessary for each action they perform
D.
one improves muscular action consciously
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