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临时消防竖管的管径应根据室内消防用水量、竖管给水压力或流速进行计算确定，且管径不应小于（）。
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手动单叶片或多叶片调节阀的手轮或扳手，应以 转动为关闭，其调节范围及开启角度指示应与叶片开启角度相一致。()
Nancy complained about the ____ air conditioner she bought from the department store
使用“资源管理器”时()，不能删除文件或文件夹。
____ racial problems have not been solved and full equality has not been attained yet, progress in these directions has been quite remarkable
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