砖砌墙体施工时,当纵横墙不能同时施工且留直槎时,应埋拉接钢筋,拉接钢筋的埋入长度每边均不应小于()。
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