【判断题】光电效应可以证明光具有粒子性,因此光不是一种波。
【简答题】Man-made satellites have been sent up into space by many countries. These satellites go round the earth and help us to learn more about the earth, the weather and other things. Most countries use thes...
【单选题】关于VIN码LSVHJ133022221761表述正确的是( )。
【单选题】在Compendex数据库中,叙词Satellites和相关词语的关系如下: Used for:Artificial satellites; Broader Terms:Spacecraft; Narrower Terms:Communication satellites,Geodetic satellites。 其中不可用于检索的词是( )。
D.
Communication satellites
【简答题】完形填空。 Man has invented four kinds of satellites. The first kind of satellites studies the 1 of the earth. They are used to make maps. They also help countries to see where they can 2 oil or gold. The ...
【单选题】关于VIN码LSVHJ1330221761表述正确的是()
【单选题】关于VIN码LSVHJ133022221761表述正确的是( )。
【简答题】The rockets take astronauts and man-made satellites into space. The satellites are used for communication, weather monitoring and research. But how do satellites stay up without falling down? There ar...
【判断题】直链淀粉含量在15-20%的稻米(粳米的直链淀粉含量大多在此范围),蒸煮时米饭柔软,黏性较大,涨性小