火力发电厂的能量转化过程是：由煤的化学能通过燃烧转化为热能，热能通过汽轮机转化为机械能，最后经发电机转化为（ ）。
参考答案：电能。
--- When did you buy this computer? It looks so new.
--- I it for only a couple of days. My sister bought it for me as a birthday present.
A．bought
B．have bought
C．have had
D．had
下列哪项不是门静脉高压症病人分流手术指征
A．胃底曲张静脉破裂出血病史B．肝功能较好C．血浆白蛋白在3g%以上D．严重肝昏迷E．肝硬化病史
