单层工业厂房的跨度在18m及18m以下时,应采用扩大模数30M数列;在18m以上时,应采用扩大模数60M数列。 ( )
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