When the steel
举一反三
- When grease is used, the prestressing steel is permanently free to move relative to the sheathing and the tendon is referred to as an]（）tendon.
- If the carbon content of a type of steel is 0.1%， this steel is a kind of （ ）. A: low-carbon steel B: medium-carbon steel C: high-carbon steel D: HTLA steel
- Steel structure is the engineering structures made of shaped steel and steel plate.
- Competely annealing is mainly used for ( ). A: hypoeutectoid steel B: eutectoid steel C: hypereutectoid steel D: all steel
- A steel company sells some steel to a bicycle company for $150. The bicycle company uses the steel to produce a bicycle，which it sells for $250. Taken together， these two transactions contribute（ ）. A: $250 to GDP. B: $150 to GDP. C: between $250 and $400 to GDP, depending on the profit earned by the bicycle company when it sold the bicycle. D: $400 to GDP.