赤铁矿边界品位是()
A、30%
B、25%
C、20%
D、28~29%
参考答案:B
低分化涎腺黏液表皮样癌与鳞状细胞癌的鉴别要点是()
A.表皮样细胞
B.黏液细胞
C.中间细胞
D.鳞状化生
E.未分化细胞
If we ______ day before yesterday, we would have done the job.
A.hadn't been interrupted
B.weren't being interrupted
C.wouldn't be interrupted
D.weren't interrupted