Page 20 - สารพิษในชีวิตประจำวัน
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                                                            ใบงาน

                                                  การเข้าสู่ร่างกายของสารพิษ
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                  คําสั่ง  :  ให้ผู้เรียนทํากิจกรรมตามใบงานต่อไปนี้

                          1.  ลักษณะสําคัญของช่องทางที่สารพิษเข้าสู่ร่างกายทั้ง 4 วิธี มีกี่ลักษณะ อะไร
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