成卷的未曝光的黑白摄影感光纸()

After the new technique was introduced, the factory produced _____ tractors in 1998 as the year before.[ ]

A. as many twice 　

B. as twice as many

C. twice as many 　

D. twice many as

财政支出总规模所产生的效益可称为（）。

A.财政支出总量效益

B.财政支出结构效益

C.财政支出项目效益

D.财政支出规模效益

The growth of phytoplankton is often limited by the availability of ______.

A．oxygen

B．hydrogen

C．nitrogen

D．carbon dioxide

经前吐血、衄血，量较多，色鲜红，心烦易怒，两胁胀痛，口苦咽干，其辨证为：

A．肝郁气滞

B．肝经郁火

C．肺肾阴虚

D．阴虚火旺

E．肝阳上亢

人体的内环境稳态依赖于神经—体液调节机制来实现，请据图回答有关问题：

若刺激A点，则图中的灵敏电流计偏转（）次。