Which of the following may hardness of the boiler water cause？（1) scale formation; （2) tube failure; （3) corrosion.

A.(1) and (2)

B.(1) and (3)

C.(2) and (3)

D.(1), (2) and (3)

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Which of the following may hardness of the boiler water cause？ （1) scale formation; （2) tube failure; （3) corrosion.