骨肿瘤样病变包括()
A.骨纤维异常增殖症
B.骨嗜酸性肉芽肿
C.骨囊肿
D.动脉瘤样骨囊肿
E.非骨化性纤维瘤
参考答案:A, B, C, D
She ____________ Lingling. He ____________ Daming. They ____________ friends. [ ]
A. is; is; are
B. are; am; is
C. am; are; is
简述一些金属离子,如Fe3+、Cu2+等可在油脂氧化反应中发挥催化作用的原因。