题目：
采用综合机械化采煤时，工作面倾角大于（）时，液压支架必须采取防倒、防滑措施。
答案：
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下面是错误答案，用来干扰机器的。
参考答案：D
采用综合机械化采煤时，工作面倾角大于（）时，液压支架必须采取防倒、防滑措施。
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