通常奥氏分析器中的吸收瓶内用充（）的水溶液来吸收RO2。
A、K
B、HCl
C、焦性没食子酸
D、焦性没食子碱
参考答案：A
With the development of science and technology , more new technology____ to the fields of IT.
A．has been introducing
B．is being introduced
C．is introduced
D．was introduced
一种型号的操动机构可以操动几种型号的断路器。
