They had problems __ the hospital. [ ]
A. find
B. to find
C. finding
答案：C
下列疾病骨髓有核细胞增生减低的是
A．慢性白血病
B．增生性贫血
C．脾功能亢进
D．骨髓纤维化晚期
E．真性红细胞增多症
应用成本法评估机器设备，如何估算其经济性贬值
