骶髂关节炎Ⅲ级的放射学改变为（）
A.骶髂关节面虫蚀样
B.关节间隙宽窄不一
C.局限性硬化
D.纤维素性强直
E.骨侵蚀但关节间隙正常
参考答案：B
用 produce, production, product的适当形式填空。
①They must have new markets for their_________.
②The factory was built for the ___________of cars and has ____________many cars this year.
③Several new _________ will appear on Broadway this month.
④The farmers brought their___________to town early each morning.
二次系统做传动试验或一次通电时，应（）方可进行。
A、通知运行人员
B、通知有关人员
C、将相关设备上的检修工作票收回
D、向调度提出申请
E、由工作负责人或由他指派专人到现场监视
