对重要结构件因锈蚀磨损引起壁厚减薄,当减薄量达到原壁厚()时,应判为不合格。
A.10%
B.20%
C.30%
D.40%
参考答案:A
—Did you enjoy your journey to Beijing last weekend?
— . We had driven more than 3 hours before we found the right way.
A.Absolutely
B.No way
C.Not at all
D.With pleasure
操作系统中有一组不能被系统中断的特殊系统调用,在操作系统中称为( )。
A.主程序
B.原语
C.初始化程序
D.进程控制块