59. 研磨紙上標示如 AA-400-Aw 時,AA 是指研磨粒子為何物?
(A)Al2O3
(B)Fe2O3
(C)SiC
(D)CaCO3
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統計: A(1), B(0), C(0), D(0), E(0) #3729259
統計: A(1), B(0), C(0), D(0), E(0) #3729259