A cast steel strong back is fitted in way of the combustion space to help absorb（）

A cast steel strong back is fitted in way of the combustion space to help absorb _____.

A.flame temperature

B.fuel oil

C.air movement

D.gas forces

A.flame temperature

B.fuel oil

C.air movement

D.gas forces

Concrete is strong in compression but weak in tension. Therefore, reinforcement is needed to resist the tensile stresses resulting from the loads. Additional reinforcement is occasionally used to reinforce the compression zone of concrete beam sections. Such steel is necessary for heavy loads in order to reduce long-term deflections. Reinforce concrete systems are composed of a variety of concrete structural elements that, when synthesized, produce a total system. The components can be broadly classified into: floor slabs, beams, columns, walls, and foundations. Beams are the structural elements that transmit the loads from floor slabs to vertical supporting columns. They are normally cast monolithically with the slabs and are structurally reinforced on one face, the lower tension side, or both the top and bottom faces.

A.cast iron

B.forged steel

C.stainless steel

D.cast steel

A.Cast iron

B.Cast steel

C.Forged steel

D.Aluminum

A.alloy steel

B.resistance heat steel

C.cast steel

The connecting rod is made of ______.

A cast iron

B forged alloy steel

C aluminum-alloy

D sheet steel

A.steel

B.copper

C.cast iron

D.stainless steel

A.cast iron

B.forged steel

C.stainless steel

D.cast steel

A、carbon steel

B、alloy steel

C、cast iron

D、tool carbon steel