You are scanning the radar screen for a buoy fitted with racon. How should this signal appear on the PPI display?()
A. Starting with a dash and extending radially outward from the target
B. As a broken line from center of PPI to the target
C. Starting with a dot and extending radially inward from the target
D. Starting with a dash and extending to the right of the target
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中国境内销售的产品或者其包装上的标识可以只有英文标明的产品名称、生产厂厂名和地址
A. 正确
B. 错误
当二极管反向电压持续增大到一定数值以后,反向电流会突然增大,此现象称二极管的()
A. 伏安特性
B. 正向特性
C. 反向特性
D. 反向击穿特性