[单选题]按我国有关规范对转速禁区的规定，下述讲法不恰当的是( )。

正确答案 ：C

禁区不得超越

[单选题]The correct procedure for giving an auxiliary boiler a bottom blow, is to begin .

正确答案 ：A

when the boiler has been secured long enough for most solids to settle

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