What____used as chief building materials today____steel and concrete.
A: have been . . . are
B: is . . . are
C: are . . . are
D: are . . . is
A: have been . . . are
B: is . . . are
C: are . . . are
D: are . . . is
C
举一反三
- 智慧职教: What ___ used as chief building materials today __ steel and concrete.
- Concrete is a polluting material, so all green building materials can be used to replace it. A: 正确 B: 错误
- Engineering materials such as steel and concrete are the basis of construction projects.
- 中国大学MOOC: Concrete is a polluting material, so all green building materials can be used to replace it.
- Under a certain long-term load, concrete would creep. In the reinforced concrete axial compressive members: A: Creep increases the compressive stress of concrete. B: The compressive stress of concrete and steel bar keeps unchanged. C: Creep decreases the compressive stress of concrete and increases the compressive stress of steel bar. D: Creep increases the compressive stress of concrete and decreases the compressive stress of steel bar.
内容
- 0
What are the main building materials used in traditional Chinese architecture? A: Wood B: Brick C: Stone D: Soil
- 1
In Canada, most houses use ___________ for building the walls. A: wood B: concrete C: brick D: steel
- 2
“I’m on a high today” means I have been to a high building today.
- 3
Composite materials have been in existence for many centuries. The earliest man-made composite materials were straw and mud combined to form bricks for building construction.。（ ）
- 4
The building __________ you used to live has been pulled down. A: that B: which C: where D: what