A.3GHz B.6GHz C.9MHz D.9GHz
A.6 B.8 C.12 D.16
A.無(wú)聲,無(wú)閃光 B.無(wú)聲,快閃光 C.發(fā)聲,慢閃光 D.發(fā)聲,快閃光