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【单选题】
现有3个同时到达的作业Jl、J2和J3,它们的执行时间分别为tl、t2和t3, 且tl
A.
tl+t2+t3
B.
(tl+t2+t3)/3
C.
(3t1+2t2+t3)/3
D.
(t1+2t2+3t3)/3
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