支气管动脉栓塞治疗大咯血应首选的栓塞剂是（）
A.明胶海绵
B.PVA颗粒
C.自体血凝块
D.无水酒精
E.弹簧钢圈
参考答案：A
We set no limit to the _______ you can make to support children in the poor areas. Big or small, it shows your concern for them.
A．generosity
B．choice
C．donation
D．contribution
62，投资者买卖ETF须用A股账户；投资者申购、赎回ETF须用A股账户或基金账户。( )
