血清中常规检查检测不到的HBV标志物是（）
A.HBsAg
B.HBeAg
C.HBcAg
D.抗-HBe
E.抗-HBc
参考答案：C
______ giving up, he went on with his research,got his PhD and married the girl.
A．Without
B．Except
C．Instead of
D．But for
3311E汽车在前制动卡钳中，每个卡钳制动总成有（）个衬板。
A.1
B.2
C.3
D.4
