钢的表层碳分较内层碳分降低的现象称为（）。
参考答案：脱碳
不属于恶性黑素瘤中瘤细胞形态表现的为（）
A.多边形
B.梭形
C.空泡形
D.泡沫状
E.树枝状
What surprised me most was to see the girl laugh the way _____ her mother did at that age. [ ]
A. /
B. which
C. with which
D. where
