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单选题 In former times ______ was used for melting iron because it was hotter and purer than coal
学科：默认课程
时间：2025-12-12 00:19:44
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题目1单选题
A ______ is a machine for holding pieces of wood, metal, or plastic, and turning them rapidly against a cutting tool used to shape themA. cutterB. workpieceC. fastenerD. lathe
题目2单选题
______ is a bluish-white metallic chemical element used to plate metal objects with a protective surfaceA. BrassB. BronzeC. SodiumD. Zinc
题目3单选题
A force has direction as well as ______A. extentB. greatnessC. magnitudeD. vector
题目4单选题
There is only a wooden ______ between the bedsA. liningB. latticeC. panelD. partition
题目5单选题
The colors of the rainbow are the ______ of white lightA. constitutionsB. constituentsC. conjunctionsD. configurations
题目6单选题
In former times ______ was used for melting iron because it was hotter and purer than coalA. charcoalB. cokeC. fossilD. graphite
题目7单选题
Einstein was convinced that the ______ is an orderly, continuous unityA. spaceB. spacingC. aerospaceD. cosmos
题目8单选题
Scales are in ______ when the weights on each side are equalA. equationB. equatorC. equilibriumD. equivalent
题目9单选题
______ of the moon occurs when the moon enters the earth's shadowA. An eclipseB. A rainbowC. A slipD. A tip
题目10单选题
Geometrical ______ grew out of empirical methodsA. terminologyB. theoremsC. themesD. terms
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