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。