有一种成分是补体反应的枢纽,既在两种激活途径中起中心作用,也是补体活化时正反馈的关键性成分的补体成分是()
A.C1
B.C2
C.C3
D.C4
E.C5
参考答案:A
影响和制约员工工作绩效的因素包括()。
A.企业外部环境
B.企业内部因素
C.员工心理条件
D.个人体力条件
E.目标设定的合理性
句型转换。
1. There is a post office near here.(改为一般疑问句并作否定回答)
--_________ _________a post office near here.
--No,________ _________.
2. There is some salad here.(改为否定句)
There_________ _________salad here.
3. His mother works in a school.(就画线部分提问)
_________ _________his mother work?
4. The bank is next to the library.(就画线部分提问)
_________ _________the bank?
5. Excuse me. Could you tell me where the pay phone is?(改为同义句)
Excuse me. _________ _________ _________pay phone here?