对仪表设备进行（）时，应有防止弱电设备及电子元件被损坏的措施。
A.试压清洗
B.交接试验
C.电阻测量
D.绝缘电阻测量
参考答案：D
—How did you find your visit to Qingdao, Joanna?
— _________.
A．Oh, wonderful indeed
B．I went there alone
C．First by train and then by ship
D．A guide showed me the way
自动对焦最主要的特点是什么？
