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【单选题】
在下列条件语句中,只有一条语句在功能上与其他三条语句不等价(其中 exp1 和 exp2 表示某条C语句),这条不等价的语句是 。
A.
if (x) exp1; else  exp2;
B.
if (!x) exp2; else  exp1;
C.
if (x != 0) exp1; else  exp2;
D.
if (x == 0) exp1; else  exp2;
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D.
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A.
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支柱绝缘子破损
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A.
空气湿度增大
B.
支柱绝缘子破损
C.
触头脏污
D.
拉杆受潮
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