题干

下列事实与解释不相符的是(    )

A:夏天防雷电,远离金属——金属具有导电性

B:某粒子的结构示意图为:      ——该粒子属于阳离子

C:用炭黑墨汁书写的字经久不变色——常温下,碳的化学性质稳定

D:二氧化碳和一氧化碳的化学性质不同——二氧化碳和一氧化碳的分子构成不同

上一题 下一题 0.0难度 选择题 更新时间:2019-05-05 11:04:55

答案(点此获取答案解析)

B

同类题4

阅读理解

B

    Researchers say they have created a new super-tough material in the laboratory. It is stronger, lighter and costs less than steel. But the new material is not a product of high technology. It is wood. Researcher Liangbing Hu says that it can compete with some of the world's strongest materials or even replace steel.

    The product is called Super Wood. It doesn't require any special raw, unprocessed material. That means the cost of the product will be relatively low.Hu said, “We can start with very cheap wood, and also very fancy, expensive wood. But in the end, we get very similar performance.”

    Super Wood is made by partially removing a natural polymer called lignin(木质素). Hu explained, “Lignin is like glue to hold all the parts together in natural wood. To be able to densify(增密)the wood completely, some of the lignin has to be removed. “Strong chemicals are put on the wood to remove about half of its lignin. Then, after being left in extreme heat and pressurized for a day, the treated wood is ready.

    The wood is strong enough to build automobiles, airplanes, wind turbines and more. Researchers are finding many new ways to use wood, including creating batteries and see-through wood and paper.Hu said, “Wood has been existing on Earth for more than a million years. And human beings have been using wood for furniture, construction for more than 10 thousand years. And the more we worked on this material, we realized, we have never fully exhausted the potential of this amazing material.”