With （）， the corrosion problems are much reduced in a central cooling system.

( ) occurs when a material is subjected to repeated loading and unloading. A: Fatigue B: Fracture C: Impact D: Corrosion

The problems that ferritic steel produces during welding are ( ) and ( ). A: Grain refinement B: Intergranular corrosion C: Toughness increase D: Hardening tendency

The problems that ferritic steel produces during welding are ( ). A: Grain refinement B: Intergranular corrosion C: Toughness increase D: Hardening tendency

What is the formation of stalactites mainly related to? A: The erosion of calcium carbonate B: The precipitation of calcium carbonate C: earthquakes D: the corrosion from wind

It is hard for me to say no to a person who turns to me for help, because a refusal is against my . A: conscious B: conscience C: collision D: corrosion

To lubricate the swivel or remove corrosion from a fire hose coupling，you should use（）. A: glycerine B: graphite C: kerosene D: fresh water and soa

What is NOT a problem when carrying coal? （） A: The requirement for through-ventilation B: The corrosion some types of coal will cause to the ship C: Spontaneous heating D: Generation of methane ga

Which of the following are characteristics of the steel structure? A: High strength and low weight B: Good plasticity and toughness C: Easy to manufacture and construct D: Weak corrosion resistance

The least serious damage caused by acid rain is _________. A: poisoning of plant roots B: leaching of heavy metals C: changing the blood chemistry in D: corrosion of metal structures