วัสดุกัมมันต์(wát-sà-dù gam-man)

Phân tích từ

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วัสดุกัมมันต์wát-sà-dù gam-manวัสดุกัมมันต์wát-sà-dù gam-manchất phóng xạ; vật liệu phóng xạ