若_(1)+((k)^2+1)(x)_(2)+2(x)_(3)=0-|||-_(1)+(2k+1)(x)_(2)+2(x)_(3)=0-|||-(x)_(1)+k(x)_(2)+(2k+1)(x)_(3)=0只有零解，则_(1)+((k)^2+1)(x)_(2)+2(x)_(3)=0-|||-_(1)+(2k+1)(x)_(2)+2(x)_(3)=0-|||-(x)_(1)+k(x)_(2)+(2k+1)(x)_(3)=0必须满足（）

若只有零解，则必须满足（）

A.且

B.且

C.且

D.且

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