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【单选题】
According to the passage, we can draw the conclusions except thatA.
the production efficiency has greatly been improved by the 'American System'.
B.
many other machines such as refrigerators, washing machines and vacuum cleaners are produced on the assembly line.
C.
with the interchangeable parts, American industries advanced greatly.
D.
the industrial managers began the careful study of the operations with the aim of reducing the methods.
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