猪苓粉末中可见
A.木栓细胞
B.厚壁细胞
C.菌丝
D.草酸钙结晶
E.淀粉粒
参考答案:C,D
We had to read ______ the light of a candle because the light went out.
A.by
B.in
C.with
D.on
在种群的S型增长曲线中,达到()值时种群的增长速率最快,达到K值时种群的增长速率为0。