对低碳素钢表面缺陷进行清理一般采用（）。
A.砂轮清理法
B.火焰清理法
C.电弧清理法
参考答案：B
Kate didn't come yesterday, or you ________ her. [ ]
A. might have seen
B. were to see
C. had seen
D. would see
提示HBV活动性复制和有传染性的指标是（）。
A．HBsAg
B．抗－HBs
C．HBeAg
D．抗－HBe
E．HBcAg
