细菌性痢疾的主要实验室检查是
A．特异性抗原B．特异性IgG抗体C．特异性IgM抗体D．病原体培养E．病原体核酸检测
参考答案：D
With the development of science, more new technology _______ to the fields of IT. [ ]
A. has introduced
B. was introduced
C. is introduced
D. is being introduced
如果辅助逆变器出现故障或者高压失电，应急照明就由（）供电。
