题干

下列句子中,没有语病、句意明确的一句是(  )


A:六部委联合举办的“中华赞”诗词征集活动,将围绕春节、清明、端午、中秋四个传统节日为主题征集原创性诗词。

B:酸奶比鲜奶更容易消化吸收,它特有的益生菌能够以足够数量直达肠道,并保持更持久的活性,有效改善食物的胃肠通过时间。

C:当前学术界有一种好虚荣的风气,浮躁的人很多,而甘愿认真踏实地搞研究的人不多了,王学远就是其中的一个代表。

D:“星火”公益活动旨在通过有组织的资金捐助、技能培训和就业辅导等途径,改善下岗工人的生活条件,并为他们创造更好的工作机会。

上一题 下一题 0.0难度 选择题 更新时间:2019-03-17 10:53:54

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D

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    A team of engineers at Harvard University has been inspired by Nature to create the first robotic fly. The mechanical fly has become a platform for a series of new high-tech systems. Designed to do what a fly does naturally, the tiny machine is the size of a fat housefly. Its mini wings allow it to stay in the air and perform controlled flight tasks.

    “It's extremely important for us to think about this as a whole system and not just a bunch of individual components (零件),” said Robert Wood, the Harvard engineering professor who has been working on the robotic fly project for over a decade. “The added difficulty with such a project is that actually none of those components are off the shelf and so we have to make them all on our own,” he said.

    They engineered a series of systems to start and drive the robotic fly. “The seemingly simple system which just moves the wings has a number of individual components, each of which individually has to perform well, and then has to be matched well to everything it's connected to,” said Wood. The flight device was built into a set of power, computation, sensing and control systems. Wood says the success of the project proves that the flying robot with these tiny components can be built and manufactured.

    Wood says the design offers a new way to study flight mechanics and control at insect- scale. Yet, the power, sensing and computation technologies on board could have much broader applications (应用). “You can start thinking about using them to answer open scientific questions, you know, to study biology in ways that would be difficult with the animals, but using these robots instead,” he said. “So there are a lot of technologies and open interesting scientific questions that are really what drives us on a day to day basis.”