在无线传输中，λ是发射信号的波长，要想保证有效的辐射，所需的天线长度一般应大于()。
A、λ/3B
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preferred,prefers,is,are,was,were,willbe,shallbeDuringtheholidayweek,one-thirdofthestudentsinourclass________preparedtostayoncampusforstudywhilearoundtenpercentofthem________somemoresleepathome.
Moderneconomics________thecountry’sagriculturalpolicies.
Iwaswritingareportlastnight;________Iwouldnothavestayeduplate.
Amongthefollowingwriters()isgenerallyregardedastheforerunnerofthe20th-century“stream-of-consciousness”novelsandthefounderofpsychologicalrealism.
is,are,has,have,havingTheaverageBritishfamily,which________smallerandricherthan50yearsago,________3.6members.
