日注量相等的驱油方案，（）相同，最终采出程度基本相同。
A、注入浓度
B、注入粘度
C、段塞推进速度
D、注入速度
参考答案：C
________ was known to them that the boss had broken his promise ________ he would give them a rise.
A．What; what
B．It; which
C．It; that
D．As; that
郑州商品交易所绿豆期货合约的最小变动价位是2元/吨，那么每手合约的最小变动值是( )元。
A．2
B．10
C．20
D．200
