关于分子的热运动，下述正确的是（ ）
A．分子的热运动就是布朗运动
B．布朗运动是悬浮在液体中的微粒的无规则运动，它反映液体分子的无规则运动
C．温度越高，悬浮微粒越大，布朗运动越激烈
D．物体的速度越大，内部分子的热运动越激烈
布朗运动是悬浮在液体当中的固体颗粒的无规则运动，是液体分子无规则热运动的反映，故A错误B正确．
温度越高，布朗运动越激烈，悬浮微粒越小，布朗运动越激烈，故C错误．
物体的速度是宏观量，而分子的热运动是微观量，它们之间没有关系，故D错误．
故选B．
Leonardo may have been the greatest genius(天才) have ever known. He lived in Italy around the year 1500,but many of his inventions seem modern to us today. For example, one of his notebooks has drawings of a helicopter. Of course, he couldn’t a helicopter with the things he had. But scientists say his idea would have worked. But Leonardot an inventor. He was one of the greatest artists of his day. By the time he was twenty years old, he was called a master(大师）painter, and as he got older he became more famous. Sometimes he drew a hand ten different way she was ready to paint. Many of Leonardo’s wonderful paintings are still with today. You may know one of his most famous works the woman known as the Mona Lisa.
|