下列补体固有成分中分子量最大的是()。
A.C3
B.C8
C.Clq
D.C5
E.C4
参考答案:C
Not everyone is equal to the task because it special skills and much patience.
A.calls for
B.calls out
C.turns into
D.turns up
磨损的结果使材料尺寸(),冲孔尺寸()。
A.增大,增大
B.减少,减少
C.增大,减少
D.减少,增大