钢号:ZG40CrMnMoVB,说明各符号的含义,合金元素含量范围是多少?
参考答案:
ZG—铸钢;40-含碳0.4%;Cr、Mn、Mo、V和B<1.5%。
- I hear that Jason is planning to buy a car.
-I know. By next month, he _ enough for a used one.
A.will have saved
B.will be saving
C.has saved
D.saves
预制构件可根据需要选择自然养护、蒸汽养护、电加热养护。采用蒸汽养护时,应合理控制升温、降温速度和最高温度,构件表面宜保持()的相对湿度。
A.60%~70%
B.80%~90%
C.70%~80%
D.90%~100%