屈服强度400牛顿/平方毫米的经酸洗的热轧非合金钢板(规格：宽800毫米、长2，000毫米、厚4毫米)

A. Forty-three.
B. Thirty-one.
C. Seventy-five.
D. Forty-six.

A. The crust.
B. The ground.
C. The plate.
D. The boundary.

A. 对
B. 错

A. Income, years of schooling and job type.
B. Income and work environment.
C. Education and mood.
D. Occupation and influence of family members.