40Cr钢的CCT曲线在焊接条件下比在热处理条件下向左移动,说明在同样的冷却速度下,焊接时比热处理时淬硬倾向()
A.大
B.小
C.较大
D.相同
参考答案:B
Our family were thinking about __________ Hainan Island at this time yesterday.
[ ]
A. to visit
B. Visited
C. visiting
D. visit
简述涎腺多形性腺瘤的病理特点。