变压器哪些部位易造成渗油？
Wires should have each feature of the following except （） ["flame retardant","moisture resistant","oil resistant","low conductivity"]
在Windows中不用物理键盘就不能向可编辑文件输入字符。
可用于将数字数据编码为数字基带信号的方法是（）。 ["FSK（Frequency Shift Keying，频移键控，数字调制方法）","NRZ（非归零码）","PCM（脉冲编码调制，模数转换方法）","QAM（Quadrature Shift Keying，正交振幅调制，属于新型数字调制方法）"]
（）connectors hold best if a wire is accidentally pulled or a connection becomes loose. ["Ring type","Fork type","Spade type","Push on pull off type"]
烟气脱硫装置由哪几部分组成？
