皮皮学，免费搜题
登录
搜题
【单选题】
假若某生态系统有四种生物，并构成一条食物链a→b→c→d，在某一时间分别测得这四种生物a、b、c、d所含的有机物总量分别为m1、m2、m3、m4。下列叙述中，错误的是（）A.
四种生物中所含的能量归根到底来自于a通过光合作用固定的太阳能
B.
在一段时间内，若b种群数量增加，则a种群数量下降，d种群数量增加
C.
若m1＜m2，则生态系统的稳定性就会遭到破坏
D.
d个体所含的有机物的质量一定比c个体所含的有机物的质量小
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【简答题】阅读下面短文，根据所读内容，在文章后小题的空格里填入一个最恰当的单词。 Blood donation, also called blood banking, is a wonderful thing to do. It is an easy and direct way of a contribution to social work and having a big effect ...
【单选题】The patient in the previous question had very high blood glucose levels, and his urine also contained high blood glucose levels. The high blood glucose levels can lead to cerebral dysfunction owing to...
A.
Dehydration
B.
Reduced lipid concentrations in the blood
C.
Increased lipid concentrations in the blood
D.
Hyperhydration
E.
High ammonia levels
F.
Low ammonia levels
【单选题】The Great Wall was made not only by _______, but also the flesh and blood of ________ men.
A.
earth and stone, millions of
B.
earths and stones, millions
C.
the earth and stone, million of
D.
the earths and stones, millions
【简答题】Blood donation(献血), also called blood banking, is a wonderful thing to do. It is an easy and direct way to contribute to social work and help the community. It helps to save lives and helps those who ...
【简答题】客户满意中心论企业管理的重点是_____
【单选题】The formation of blood is also known as ______.
A.
hematopoiesis
B.
hemopoiesis
C.
homopoiesis
D.
both A and B
【简答题】Blood donation, also called blood banking, is a wonderful thing to do. It is an easy and direct way to contribute to social work and help the community. It helps to save lives and helps those who are ...
【单选题】In their research, the Niculescus team found out______.
A.
the blood test method also works for women
B.
the blood test can give false results
C.
11 gene changes which lead to suicide feelings
D.
biological markers which tell who may commit suicide
相关题目：
参考解析：
知识点：
题目纠错 0
发布
