what chemicals did you use to treat the boiler water ?when you test alkalinity and acidity of water in boiler by pH test paper ? the result shows the boiler water is in acidiity . please describe what the possible cause is .
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Which of the following components are used to convert alternating current produced in the
Armature and equalizer
B. Commutator and brushes
C. Rotor and interpoles
D. Field and exciter
The purpose of treating the cooling water of the diesel engine is to____. I、 resist the scale formation in the cooling chamber II、 lubricate the engine part III、 increase thermal capacity IV、 resist corrosion
A. I +II
B. II + III
C. III + IV
D. I +IV
自1854年以来,NBER已经确认了________。
A. 82个完整的经济周期
B. 33次经济增长和25次经济衰退
C. 33个完整的经济周期
D. 25次经济增长和33次经济衰退
E. 17个完整的经济周期
Among the basic categories of equipment, which of the following are used to convert the hydraulic energy into linear motion?
A. hydraulic pumps
B. valves
C. hydraulic cylinders
D. hydraulic motors