锅炉压力容器焊工考试合格证的有效期为＿年。
A.10
B.5
C.3
D.1
参考答案：C
His bravery in the large earthquake in Sichuan Province_______ him great respect.
A．gained
B． earned
C． inspired
D． Honored
如何做机械超速试验？合格标准是什么？
