题干
After the new technique was introduced, the factory produced _______ in 2010 as the year before.
A：as twice many machine
B：twice many as machine
C：as many machines twice
D：twice as many machine
答案(点此获取答案解析）
D
COad ， O2
2Oad ，COad + Oad→CO2（式中标有ad的物质表示吸附在金属铂表面的原子或分子），下列说法错误的是（）