A. 结构整体性强 B. 抗震性能好 C. 抗震性能差 D. 梁板布置灵活 E. 梁板布置局促
A. 120.0 B. 180.0 C. 240.0 D. 280.0
A. too little seal water B. improper gravity disc C. oil discharging pump not working very well D. low water level of the working water
A. 氢 B. 氧 C. 氮