单项选择题

A.开关频繁
B.要求瞬时启动
C.连续调光
D.有高速运转物体
相关考题

问答题 立足国内资源,实现粮食基本自给,是中国解决粮食供需问题的基本方针。中国将努力促进粮食增产,确保在正常情况下粮食自给率不低于95%,净进口量不超过国内消费量的5%。现阶段中国已经实现了粮食基本自给,在未来的发展过程中,中国依靠自己的力量实现粮食基本自给,客观上具备渚多有利因素。根据中国农业自然资源、生产条件、技术水平和其他发展条件,粮食增产潜力很大。

问答题 We are still in the middle of the Industrial Revolution. We had better be, for we have many things to put right in it. But it has made our world richer, smaller, and for the first time ours. And I mean that literally: our world, everybody" s world.From its earliest beginnings, when it was still dependent on water power, the Industrial Revolution was terribly cruel to those whose lives and livelihood it overturned. Revolutions are—it is their nature, because by definition revolutions move too fast for those whom they strike. We still live in the middle of the Industrial Revolution and find it hard to see its implications, but the future will say of it that in the ascent of man it is a step, a stride, as powerful as the Renaissance. The Renaissance established the dignity of man. The Industrial Revolution established the unity of nature.

问答题 尽管中国农业进一步发展面临不少困难,但我们仍将不懈努力,用行动来兑现诺言,要依靠自己的力量解决好吃饭问题。我们愿与世界各国携手奋进,共同创造一个无饥饿、无贫困、可持续发展的世界。