根据《票据法》规定，需要进行承兑的汇票主要是______汇票，无需提示承兑。
参考答案：见票即付
He is a very honest man. He never _______ lies. [ ]
A. says
B. speaks
C. tells
D. talks
氧气发生站水煤气、半水煤气的含氧量达到( )时必须停炉。
A．0.5%
B．1%
C．1.5%
D．2%
