2sk2850怎么判断好坏

900VN沟道场效应管MOSFET2SK96201,TO3P,FUJ,DIPMOS,N场,900V,8A,2ΩSTW8NC90Z,ST,TO247,DIPMOS,N,900V,76A,138Ω2SK208201,TO3P,FUJ,DIPMOS,N场,900V,9A,14Ω2SK400501MR,TO220...