Diesel engine mufflers accomplish noise reduction by _____.
A.
reducing exhaust gas velocity
B.
increasing the frequency of gas vibration
C.
the use of long head pipes
D.
the use of zinc electrodes
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举一反三
【单选题】In 2010, the $471 billion deficit on the U.S. current account was offset by a surplus of $255 billion on financial account. This difference is the result of a: