Which of the following may hardness of the boiler water cause?()<br /> (1) scale formation<br /> (2) tube failure<br /> (3) corrosion<p> Which of the following may hardness of the boiler water cause?()<br /> (1) scale formation<br /> (2) tube failure<br /> (3) corrosion</p>
A、A.(1)and(2)
B、B.(1)and(3)
C、C.(2)and(3)
D、D.(1),(2)and(3)