小麦播种时,土壤耕层水分应保持在田间持水量的30-40%。
参考答案:错
肠不具有的结构是()。
A.肠脂垂
B.肠系膜
C.疏且低的黏膜环状襞
D.孤立淋巴滤泡
E.集合淋巴滤泡
—Look at the wall. There are some pictures ______ it.
—And there are two windows ______ it. [ ]
A. on; on
B. in; on
C. on; in
D. in; in