间断型广告频率是将广告宣传的时间分段安排,通常间隔时间的周期是( )
A.一个季度
B.60天
C.一个月
D.六天或十天
正确答案是D
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Einstein’s special theory of( ), far from being obscure and difficult, can be understood in its basics with no more than first-year algebra.