单项选择题
A.1B.2C.2.00000D.2.50000
A.1,5,9,13B.1,6,11,16C.4,7,10,13D.4,8,12,16
A.2B.4C.1D.8
A.(X<=Y)&&(Y<=Z)B.(X<=Y)AND(Y<=Z)C.(X<=Y<=Z)D.(X<=Y)&(Y<=Z)
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