. 1931 was the year ________ a German company began to make the first tape recorders, _______ could record and play sounds on a tape wound around a round object.
A.
that ---Which
B.
which --- That
C.
when---which
D.
when--- that
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【单选题】BSS 是 WLAN 网络的基本单位,包括一个基站( AP )和若干个终端( STA ),通讯必须通过 ( ) 来完成。