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单选题
Which of the listed chemicals can be routinely used to maintain the hygienic quality of potable water?（）
A
Hydrochloric acid
B
Chlorine
C
Sulfuric acid
D
Zinc chromate
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A gate valveB
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The breaker should be closed when one synchronizing lamp is dark and the other is brightB
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The frequency meter should be used to determine that the incoming alternator frequency is slightly higher than the busD
A portable phase sequence indicator must be used to verify the information from the lamps
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CopperB
Copper and carbonC
CarbonD
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ElectricB
HydraulicC
AirD
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