单波长双光束分光光度计测定时使用（）吸收池。
A、一个
B、两个
C、三个
D、四个
参考答案：B
_________ pleased me was that there was my purse, in the back seat of the taxi, _____ the driver couldn’ t possibly see it before.
A．That ; that
B．Which ; which
C．What ; where
D．How ; when
铁路混凝土与砌体施工应采用（）等施工手段。
A、机械化
B、工厂化
C、专业化
D、信息化
E、现代化
