参与证券投资的金融机构包括证券公司、银行和贸易公司。( )
参考答案：错
In my opinion, what Fei Junlong and Nie Haisheng _____ good to our country's international positions. [ ]
A. did do does
B. did does do
C. does did do
D. do do did
检测白细胞内杀菌功能的实验方法是 （）
A.NBT还原试验
B.相应受体检测
C.黏附抑制试验
D.趋化试验
E.吞噬试验
