防止锅炉沉积物下腐蚀的措施是()。
A.新安装锅炉应该进行化学清洗
B.提高给水水质
C.防止凝汽器泄露
D.调节锅炉水质,减少锅炉水中侵蚀性介质
参考答案:A, B, C, D
—Are you free, Jane? Let, s go to watch the movie.
—Well, time is _____, the real problem is I haven't got much money. [ ]
A. the major issue
B. the question
C. not the issue
D. out of the question
Excel中不但可以输入数字、文字等,还可以制作折线图、柱型图等统计图表。()