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单选题
国际电工委员会规定,真实声束声强lob对于胎儿为(  )。
A

lob>20mW/cm2

B

lob<20mW/cm2

C

lob>100mW/cm2

D

lob<100mW/cm2

E

lob>190mW/cm2


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解析:
国际电工委员会规定,真实声束声强lob对于胎儿为lob<20mW/cm2
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