皮皮学，免费搜题
登录
搜题
【单选题】
自然条件下，生态系统能够在较长时间内维持相对稳定，其主要原因是A.
生态系统具有一定的自我调节能力
B.
生态系统的营养结构简单
C.
物质循环能持续进行
D.
能量流动能持续进行
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】光栅常数越小，各级谱线的间距______；波长越长，相邻两级谱线间距______。
【简答题】The unemployment rate of the youth is set to rise even further this autumn, a survey of the UK ’ s biggest companies suggests. Two thirds of those surveyed said the job market would get 1 for young ...
【简答题】video_1582782862080.mp4 选短语填空 This is __ my book __ hers. We are not __ to listen to MP3 in class. His car __ on his way home yesterday. I don't know __ he wants to come to my birthday party__. He did...
【简答题】线槽敷线,绑扎点间距不应大于()m.
相关题目：