问答题

生命周期模型中最后一个阶段是（）

答案：正确答案：D.系统实施

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单项选择题

Before he became a successful dramatist, O’Neill had done a lot of other jobs EXCEPT ______.
A、a seaman
B、a prospector
C、a journalist
D、a famous actor

锅炉运行中常见的水循环故障有：[填空(1)] 、[填空(2)] 、[填空(3)] 。

答案：下降管带汽；汽水分层；水循环停滞