原发性肝癌是指()
A.胆管上皮发生的癌
B.肝细胞和肝内胆管上皮发生的癌
C.肝细胞发生的癌
D.肝细胞和肝外胆管上皮发生的癌
E.来自Kupffer细胞的恶性肿瘤
参考答案:B
. The purpose of the research had a more important meaning for them than ____.
A.ours
B.those of ours
C.it had for ours
D.it did for us
构件焊接后,在焊接接头区产生的不均匀的塑性变形是产生焊接变形和应力的主要原因。( )