With the help of the high technology, this year the factory has produced ________ it did last year.

A．twice as many as

B．twice as many cars as

C．twice as many as cars

D．twice cars as many as

橡胶测试试样调节的标准试验温度为23℃时，相对湿度为（）%；试验温度为27℃时，相对湿度为（）%。