构成血栓头部的主要成分是（）。 A.红细胞 B.白细胞 C.血小板 D.纤维蛋白 E

My father ______ his report between 7 and 9 last night . I don’t know if he has finished it .[ ]

A. wrote        

B. has written        

C. had written        

D. was writing

—Can you speak Chinese?

—Yes, I can. I _____ China for several years. [ ]

A. have been in

B. have been to

C. have gone to

企业法人内部单位，只要是单独核算的，就可以申请开立基本存款账户。( )

依据《危险化学品安全管理条例》的规定，安全评价报告应当报所在地( )人民政府负责危险化学品安全监督管理综合工作的部门备案。

A．乡级
B．县级
C．设区的市级
D．省级

县级行社申报省级达标升级原则上不受级别限制。