【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。
【单选题】影响钢液黏度的因素主要是温度和成分,下列选项中关于成分对钢液黏度影响的描述不正确的是( )
A.
同一温度下,高碳钢钢液的流动性比低碳钢钢液的好
D.
同一温度下,高碳钢钢液的流动性比低碳钢钢液的差
【单选题】关于VIN码LSVHJ133022221761表述正确的是( )。
【单选题】动物行为多种多样,下列属于先天性行为的是
【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()
【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