单项选择题

紧急呼叫(SOS)需要进行附着以后才能发起的网络服务( )

A.对
B.错
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Which of the following can best sum up the author's overall reaction to her adult son's positive response to spring cleaning?A.Surprised and skeptical.B.Elated and hesitant.C.Relieved and optimistiC.D.Optimistic and hesitant.
A.Surprised
B.
B.Elated
C.
C.Relieved
D.
D.Optimistic
单项选择题
一组数据的分布曲线呈双峰状态,据此可以推测该组数据中可能有两个(2012年全国统考) A、中数 B、众数 C、平均数 D、几何平均数
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