生长因子(growth factor)
参考答案:
当细胞受损伤因素刺激后,产生和释放多种能刺激同类细胞或同一胚层发育来的细胞增生,促进恢复的化学介质,其中多肽类最为关键。
Excuse me, Marcia, a reporter from Vanity Fair ________ all day. Could you speak to her now?
A.phones
B.has phoned
C.has been phoning
D.phoned
下列物质的化学式中,书写正确的是[ ]
A.氮气N2
B.氯化铁FeCl2
C.氧化镁MgO2
D.氯化钙CaCl