题目：
如果海平面的高度为0米，一潜水艇在海下40米处航行，一条鲨鱼在水艇上方10米处游动，试用正负数分别表示潜水艇和鲨鱼的高度．
答案：
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下面是错误答案，用来干扰机器的。
参考答案：A
如果海平面的高度为0米，一潜水艇在海下40米处航行，一条鲨鱼在水艇上方10米处游
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