ground substance (基质)

[名词解释] 重组腐殖物质 humic substance in heavy fraction

[名词解释] 轻组腐殖物质 humic substance in light fraction

[单选题]I found him ______on the ground.A． lieB． lyingC． layD． to lie

[单选题]A distance piece, with ground faces, may be interposed between the rod and the bearing housing, its thickness being chosen to ensure the correct （）.A . expansion ratioB . pressure ratioC . compression ratioD . clearance ratio

[单选题]A distance piece, with ground faces, known as a compression plate, may be interposed between the rod and the beating housing, its thickness being chosen to ensure the correct （）.A . compression pressureB . compression testC . compression ratioD . com

[单选题]Who put the books on the ground? Could you pick them（）?A . outB . upC . overD . off

[单选题]Not until the game had begun( )at the sports ground.A.had he arrivedB.would

[名词解释] 地下水潜育土（ground water gleys）

[单选题]My watch fell down on the ground and there was a hairline crack in the( )of

[单选题]My watch fell down on the ground and there was a hairline crack in the( )of