问题 问答题 简答题

土中有机质和石膏土含量较多时,含水量的测试易出现误差,误差主要由什么原因引起的?

答案

参考答案:

一般认为土在100℃-105℃温度下能将土中自由水蒸发掉,对于有机质土和石膏土来说,若将土的烘干温度定在110℃左右时,对含石膏土会失去结晶水,这样所测含水量偏小。对于有机质土其有机成分会燃烧,这样所测含水量偏大。测定结果将与含水量定义不符。

完形填空

阅读下面短文,根据以下提示:1)汉语提示,2)首字母提示,3)语境提示,在每个空格内填入一个适当的英语单词,所填单词要求意义准确,拼写正确。

How do you understand happiness? Views on it 小题1: v       from person to person. As far as I’m concerned, happiness doesn’t mean a large amount of money or being in the highest social status but 小题2:      (意味) to obtain something that enriches my mind.

However, many people have seldom experienced happiness. There are several 小题3:f      for it. Some people aren’t good at finding the sun face. They’ve just 小题4:       (抱怨)about their own misfortune or enlarged others’ joy, 小题5:         (看不见) the happiness belonging to them. Some people lack faith. They only keep telling themselves to make money as小题6:______, not knowing their life’s aims 小题7:        what on earth they really want, 小题8:       can hardly let them have the feeling of happiness. Some people always like to compare with others in every aspect, such as positions, housing conditions and treasure. Some do not know devotion, not understanding helping others will bring them more pleasure. Still some others do not know to meet. Such people 小题9:u        have possessed much but still want to seek more.

In my opinion, 小题10: s       happiness equals pleasure what pleasure for long is happy. Therefore, just keep ourselves cheerful for every minute.

问答题 简答题