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单选题
SSB发射机末级采用金属陶瓷管放大器时,末级功放应工作于().
A
甲类
B
乙类
C
甲乙类
D
丙类
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Red buoy with a horizontal yellow bandB
Red and white vertically-striped buoy with a vertical yellow stripeC
Red and white vertically-striped buoy with a red spherical topmarkD
Green buoy with a yellow square
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