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  3. [audioFiles]audio_eusm_0223(20106)[/audioFiles]A、If they don’t involve any risk

[audioFiles]audio_eusm_0223(20106)[/audioFiles]A、If they don’t involve any risk

游客2023-09-11  10
问题  
选项 A、If they don’t involve any risks.
B、If they produce predictable side effects.
C、When the urgent need for them arises.
D、When tests show that they are relatively safe.
答案 D
解析
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