A new water boiler was installed in our building last week, which could provide hot water to the students.

[单选题]The water in an auxiliary boiler should be tested for chloride content to determine ( ).A．total dissolved solidsB．salt contaminationC．water harcnessD．chlorine contamination

[单选题]The water in an auxiliary boiler should be tested for chloride content to determine （）.A . total dissolved solidsB . salt contaminationC . water hardnessD . chlorine contaminatio

[单选题]The water level showing in a boiler water gauge glass is usually ( ) duringworking.A．higher than the actual drum water levelB．equal to the actual drum water levelC．increasing due to steam condensation in the glassD．lower than actual drum wafer level

[单选题]In an auxiliary boiler steam and water system, the highest pressure will be in the （）.A . steam stop valveB . dry pipeC . feedwater systemD . generating tube

[单选题]（） provide the water to the pistons.A . Pneumatic pipesB . Hydraulic pipesC . Telescopic pipesD . Operating gas pipe

[单选题]Water and itsimportance to human life were the center of the world's attent

[单选题]Water and itsimportance to human life were the center of the world's attent

[单选题]Water and itsimportance to human life were the center of the world's attent

[单选题]Water and itsimportance to human life were the center of the world's attent

[单选题]Water and itsimportance to human life were the center of the world's attent