【单选题】【消耗次数：1】
当滑膜安装高度达到或超过（）时，对安装人员必须采取高空作业保护措施。
①
A1.5m
②
B2.0m
③
C2.5m
④
D3.0m
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相关题目
【单选题】
设有定义：int m，n，a，b，c，d；和语句m=n=a=b=c=d=0；执行：（m=a==b）（n=c==d）；后，m，n 的值分别是（）。
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