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【单选题】
某事故树的最小径集为:Pl={Xl,X2},P2={X3,X4},P3={X4,X1},则,如果X3,Xl不发生,其它事件发生,则( )保证顶上事件不发生;如X4,Xl不发生,其它事件发生,( )保证顶上事件不发生。A.
能、不能
B.
不能、能
C.
不一定能、不能
D.
不可能、能
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A.
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B.
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C.
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D.
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