40.下列常用之冷媒中,那一種冷媒的毒性最大?
(A)NH3
(B)R134a
(C)R-12
(D)R-22
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統計: A(1), B(0), C(0), D(0), E(0) #3934926
統計: A(1), B(0), C(0), D(0), E(0) #3934926