• 2022-06-06
    中国大学MOOC: Concrete, the _____gray material, is arguably the most widely-used construction material worldwide.
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      Cast iron is the most widely used engineering material, and also the most recycled of all materials A: 正确 B: 错误

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      中国大学MOOC: Multimodal transport is the most widely used in international business.

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      Plastics is a kind of ______ which is widely used in industry. A: mass B: substance C: matter D: material

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      中国大学MOOC: Before the invention of paper, what had been used as writing material?

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      中国大学MOOC: When the material absorbs water, the ____ of material will increase?