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並前往https://books.google.com.tw/books?id=7EVmFiB_v6EC&pg=RA8-PA38&lpg=RA8-PA38&dq=stethoscope+vector&source=bl&ots=xJNZiXq_65&sig=ACfU3U1gbrm_YKZPCpzh7mXsER_xJaqYhg&hl=zh-TW&sa=X&ved=2ahUKEwjnn92x9aH3AhVQwosBHVPdDaMQ6AF6BQj5ARAD

Government-wide Index to Federal Research & Development Reports

N67-21744 20K 505 10 HC $ 3.00 MF $ 0.65 MECHANICAL WAVES , VECTOR ANALYSIS ... EFFECTIVENESS MODIFIED STETHOSCOPE FOR USE IN AREAS OF HIGH NOISE LEVELS ...

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