从句分析：The fact that the concrete is slow in setting is no sign that it is of poor quality.
问题描述：
从句分析：The fact that the concrete is slow in setting is no sign that it is of poor quality.
上句中The fact that the concrete is slow in setting 是同位语从句还是主语从句?
答
个人认为应该是同位语从句,因为that在后句中不做任何成分,而且后面的句子是对fact的解释和说明.