DDZ—Ⅱ各单元由（）电源统一连接。
参考答案：220V/AC
The party was successful, but we thought it a pity not _ you.
A．invite
B．to invite
C．inviting
D．to have invited
手提行灯采用不大于36V的（）变压器供电器。
A、自耦
B、双绕组
C、单绕组
