The soot blowers are operating in the oil fuel boiler the air/fuel ratio must () throughout the action, and blowers greased after use.
A. be increased
B. be decreased
C. remain constant
D. either be increased or remain constant
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采用清水钻进时,要保证有足够的水量,不准();为防止埋钻,钻具下至距孔底1~2米时,立即开泵送水,见返水后,才能钻进。
党章总纲强调,要全面提高党的建设科学化水平,党的五大建设是指?