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Publicado por Hebei Science and Technology Pub. Date :2000-09-01, 2000
ISBN 10: 753752324XISBN 13: 9787537523240
Librería: liu xing, Nanjing JiangSu, JS, China
Libro
paperback. Condición: New. Language:Chinese.Pages Number: 325 Publisher: Hebei Science and Technology Pub. Date :2000-09 -01 2000-09-01 1st edition 1st printing. Contents: Chapter 1 biological significance of teaching and research. the status of the teaching of biology biological teaching and research needs . . Chapter 1 biological basis for teaching and research. state education laws and regulations and policy . . Chapter 1 Principles of biological teaching and research. facts.
ISBN 10: 7550925631ISBN 13: 9787550925632
Librería: liu xing, Nanjing JiangSu, JS, China
Libro
paperback. Condición: New. Paperback. Pub Date: 2019-11-01 Language: Chinese Publisher: Yellow River Water Conservancy Publishing House concrete face rockfill dam is one of the main types of earth-rock dams.?The dam body mainly plays a supporting role and is composed of rockfill or gravel. and a concrete slab is installed upstream to prevent seepage.?Face rockfill dams originated in the United States in the middle of the 19th century. They began to use dumped fill rock and planks to prevent seepage. and later changed t.