问题 问答题 简答题

褐色腐朽和白色腐朽分别是什么?

答案

参考答案:

褐色腐朽:纤维素被木腐菌借纤维素酶分解利用,木质部残留下来的是木质素,显示红褐色,一般叫褐腐,朽材易粉碎解体。

白色腐朽:木质细胞壁中的木质素被分解利用,木质部中仅留下纤维素,呈现白色,一般叫白腐,朽材不易粉碎解体,且富于弹性。

改错题
短文改错。
     此题要求改正所给短文中的错误。对标有题号的每一行作出判断:
如有错误(每行只有一个错误),则按下列情况改正:
此行多一个词:把多余的词用斜线(\)划掉,在该行右边横线上写出该词,并也用斜线划掉。
此行缺一个词:在缺词处如一个漏字符号(∧),在该行右边横线上写出该加的词。
此行错一个词:在错的词下划一横线,在该行右边横线上写出改正后的词。
注意:原行没有错的不要改。
Dear Grandpa,                                               
     Thank you for your letter,                                  
     My school is organizing a basketball team and               
there's just a chance which I can join it. I’m little of   
course, but terribly quick and bravely. While the others   
are jumping about in the air, I can run under my legs     
and get the ball. It will be lots of fun for practicing out 
in the playground in the afternoon with the tree           
around us all red or yellow and everybody laughing       
and shouting. These are  the happier girls I’ve ever      
seen and I’m the happiest in all !                       
     I meant to write long letter and tell you all the          
things I’m doing at school, but the bell was ringing,     
so I just have to stop here.                                
Love,                                                       
Judy                                                        
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问答题 简答题