??
??????
????
??????GA/Tl46-1996
(1996725? 199711??)
1
??????
????????
???????????
2
2.1 ???????????????????????
2.2 ???????????o
2.3 ????????????????????????
2.4 ??????????
2.5 ???????
2.6 ???????()??????
3?
3.1 ??5cm2????????
3.2 ??
3.3 ?????
3.4 ????
3.5 ?????
3.6 ?2cm2??4cm?
3.7 ??
3.8 ????
3.9 ???
3.10 ?26dB?????
3.11 lcm??
3.12 ?????
3.13 ????
3.14 ??
3.15 ??
3.16 ??2???1??
3.17 ????
3.18 ??lcm?
3.19 ??5cm?4cm2?2cm2?
4 ??
4.1 ??15cm2?20cm2????
4.2 ?????1cm????1.5cm???
4.3 ???...
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(?????? CA/T146-1996-07-25)
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