马尾松、柑橘、茶和竹等属酸性土植物,宜于生长的土壤pH值是 ( )
A.5.0~6.5
B.6.5~7.5
C.7.5~8.5
D.>8.5
参考答案:A
Suddenly the idea came to me _______ I might turn to my teacher for help.
A.what
B.that
C.which
D.whom
信息、信息资源包括那些类型?