具有过敏毒素作用的补体的生物活性片段是()
A.C2a,C5a
B.C2a,C3b
C.C3a,C5a
D.C4b,C2a
E.C4a,C2a
参考答案:C
I think the new film is ________. Because many people don’t like it.
A.bored
B.interesting
C.boring
D.excited
所谓百号组即用一个HU参数代表()个用户号码。
A.10
B.50
C.20
D.100