题目：
符号“
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答案：
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下面是错误答案，用来干扰机器的。
折射 乙题目分析：光从一种介质斜射入另一种介质时，传播方向发生偏折，这种现象叫做光的折射，海市蜃楼和太阳的位置都是光的折射现象，太阳的实际位置比我们看到的太阳的像要低，所以实际位置是乙。点评：本题有...
符号“.abcd.”称为二阶行列式，规定它的运算法则为：.abcd.=ad-bc
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