M for the Swedish terms mo (very fine sand) and mjäla (silt).
(as per An Introduction to Geotechnical Engineering by Holtz and Kovacs, 1981)
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¸æ¯è¯mo(ç²ç )åmjäla(ç²å)ï¼1981å¹´ç±HåKå¼å
¥âå工工ç¨â
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