29.對小孩做N2O-O2 sedation時,N2O濃度應避免超過多少?
(A)50%
(B)55%
(C)60%
(D)65%
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統計: A(699), B(178), C(126), D(54), E(0) #2626584
統計: A(699), B(178), C(126), D(54), E(0) #2626584