()加工时,为了使刀具刃口锋利,应取较大前角。
A.精
B.半精
C.粗
参考答案:C
I don’t remember how many years ago _______I last showed you around the farm.
A.it was that
B.was it that
C.it was when
D.was it when
以下表示乙肝病毒活动性复制指标的是()
A.HBcAb
B.HBeAg
C.HBeAb
D.HBsAb
E.HBsAg