CDQ锅炉有()个安全阀,分别安装在()、()。
参考答案:3;汽包;2SH出口联箱上
So much of interest _____ that most visitors simply run out of time before seeing it all. [ ]
A. offers Beijing
B. Beijing offers
C. does Beijing offer
D. Beijing does offer
4~7 某四层现浇钢筋混凝土框架结构如题4~7图所示。
题4~7图
上题中,三层中柱HI的D=()。
A.0.271
B.0.374
C.0.6
D.0.623