hnRNA是下列哪种RNA的前体()
A.真核tRNA
B.原核tRNA
C.真核mRNA
D.原核mRNA
E.真核rRNA
参考答案:C
At the sight of the policeman _____from behind the door.
A.did the boy rushed out
B.rushing out was the boy
C.out rushed the boy
D.the boy was rushing out
厩肥腐熟的外部特征,腐熟阶段是();半腐熟阶段是()。