墙板空心砖
参考答案:墙板空心砖是用规格不同、错缝铺砌的空心砖与钢筋混凝土预制、复合而成的墙板。
Their business flourished at its new location a year later owing to their joint efforts and hard work.
A.prevailed
B.failed
C.boomed
D.shrank
防排烟系统联合试运行与调试的结果(),必须符合设计与校方规定。
A.风量及负压
B.风速与正压
C.风速及负压
D.风量与正压