單項(xiàng)選擇題

A.can suppress
B.can be suppressed
C.can not be suppressed
D.are to be suppressed

你可能感興趣的試題

A.frequency allocated
B.both language and frequency
C.language used
D.transmission power and time

A.10 minutes every 4 hours
B.half an hour every other hour
C.irregular period of time
D.5 minutes every two hours