Below is a matter of theory exam of National Science Olympiad for elementary school (SD). This theory used in the selection national competitions (OSN) and international. Science Olympiad is usually held annually in different places. The following is the download link from olympiad of science. You can download it by clicking the link below. You can use this problem to train your students to become Olympic champion in the National Science Olympiad. Good luck.
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National Science Olympiad (OSN) For Elementary School (IPA SD) 2006 part 5 download