施工定额是以各分项工程或结构构件为编制对象,规定某种建筑产品的劳动消耗量、材料消耗量和机械台班消耗量。 ( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
免费的网站请分享给朋友吧