能够促进红系、粒系、单核系、巨核系祖细胞增殖，分化的调节因子是
A．SCF
B．FL
C．GM-CSF
D．G-CSF
E．M-CSF
参考答案：C
下列球形病灶的钙化特征中，哪项是不正确的()
A．结核球－斑点状或环层状钙化
B．肺炎性假瘤－粗钙化斑点
C．肉芽肿－成层形钙化
D．错构瘤－爆米花样钙化
E．矽肺－蛋壳样钙化
One day while Mr. King was working, he had a(an)（）and his left leg was badly injured.
A.business
B.accident
C.matter
D.event
