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Based on many studies, we can come to the conclusion that exposure to magnetic fields will contribute to the growing incidences of certain site-specific cancer.

【参考答案】

Y

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The probable safe level for constant exposure to electromagnetic radiation is 1 milligauss both for adults and children.

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Any frequency close to 30Hz will interfere with cues that keep our biological cycles properly timed because the frequecies are close to the ______ of man.