The correct procedure for giving an auxiliary boiler a botto

【名词&注释】

必要条件(necessary condition)

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

A. when the boiler has been secured long enough for most solids to settle
B. when the boiler has been cooled to ambient temperature
C. only after raising the water level to within 0.5 inch of the high water cutout only
D. after bypassing the low pressure

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学习资料：

[单选题]叶片马达式锚机液压系统采用的调速方法多为( )。

A. 阀控
B. 泵控
C. 变量马达
D. A+C

[单选题]构成追越的必要条件是：I、后船位于前船的尾灯光弧范围内；II、后船的速度大于前船；III、两船在互见中；IV、存在碰撞危险

A. I
B. I、II
C. I、II、III
D. I、II、III、IV

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