锅炉产品图样中，单根受热面管子、连接管、下降管等零件一般用单

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问题判断题

锅炉产品图样中，单根受热面管子、连接管、下降管等零件一般用单根粗实线表示。( )

答案

参考答案：对

选择题

If you set up your goal and start your preparations as early as possible, you will achieve your ____ to become

one of the most famous scientists in the future. [ ]

A. amusement

B. ambition

C. appointment

D. agriculture

判断题

除氧器的作用就是除去锅炉给水中的氧气。