000			00418nam a2200157Ia 4500
003			NIELib
008			211019s9999||||xx |||||||||||||| ||und||
020			_a0835113477
082			_a372.3 _bECH
245			_aEcho : beginning science
260			_bDolphin Books, _c1987. _aBeijing :
300			_a38p.; _bCol.ill.; _c21cm
650		0	_924258 _aSecondary Education
700			_924577 _aTing, Mei _eEd.
942			_2ddc _cLM
999			_c38200 _d38200