单项选择题
A.100ms/s B.200ms/s C.300ms/s D.500ms/s
A.0.5us/div~0.5s/div B.0.2us/div~0.2s/div C.0.5us/div~0.2s/div D.0.2us/div~0.5s/div
A.YA、YB、YA±YB、交替、断续 B.YA、YB、YA+YB、记忆、断续 C.YA、YB、YA+YB、交替、断续 D.YA、YB、YA+YB、交替、常态