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【多选题】
关于汽包水位调节说法正确的是( ).A.
汽包水位过高，蒸汽品质恶化；汽包水位过低，破坏水循环，温。
B.
引起汽包水位变化的根本原因就是给水量和蒸发量的平衡被破坏。
C.
锅炉汽包压力变化或锅炉负荷变化，容易引起“虚假水位”，调节时应特别注意。
D.
运行中，要将一次水位计和二次水位计指示值进行对比，防止二次水位计指示错误
E.
进行锅炉水位监视时，原则上以一次水位计显示为准。
F.
现代锅炉大都采用给水自动调节。
G.
一般采用改变给水调节阀的开度调节汽包水位
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举一反三
【多选题】Which of the following are not among the methods recommended for avoiding too many abstractions in an informative speech?
A.
U s e statistics and testimony
B.
U se narration and dialogue
C.
U se testimony and examples
D.
U se comparison and contrast .
【判断题】Although there are so many kinds of transport methods, the ocean transport method is the most widely used and welcome by the businessmen.
A.
正确
B.
错误
【判断题】There are numerous and reliable ways by which one can measure the impact of employment on student achievement, and we used several in our research (Para. 1) Meaning: There are many reliable methods to...
A.
正确
B.
错误
【多选题】Read the following concluding paragraph and decide the methods it used. ( Title: Drug addiction in the United States ) ( Introduction ) The non-medical use of certain drugs is forbidden in the United ...
A.
Universalize
B.
Suggest results or consequences
C.
Ask a provocative question
D.
End with a warning
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