投资者有两种方式参与证券交易所ETF的投资:一是进行申购和赎回;二是直接从事买卖交易。 ( )
参考答案:对
---Will you do me a favor and pick me up tonight?
---_________
A. My pleasure.
B. With pleasure.
C. Go ahead.
D. Don't bother.
矿井中有毒性气体有()
A、CO
B、CO2
C、SO2
D、NO2
E、H2S
F、NH3