气体分馏装置重沸器管程大漏，内操可以从（）来初步判断。
A、单塔物料平衡
B、塔底重沸器加热温度
C、塔顶温度
D、塔顶压力
参考答案：A, B
Zhao Benshan, whose overwork ____ his health failure last year, is reported to have performed less successfully in the 2010 Spring Festival Gala on CCTV．
A．submitted to
B．admitted to
C．devoted to
D．contributed to
读“我国某地区等高线地形图”，回答下列问题。
简述图示地区地形、地势的基本特征。
