相关人员应（）对混凝土拌和楼（站）机械转动部位的防护设施进行检查。
A.每班前
B.每班后
C.每天
D.每星期定期
参考答案：A
We thought of selling this old furniture, but we have decided to _______ it.It might be valuable.
A．hold on to
B．keep up with
C．turn to
D．look after
企业征信系统机构代码发放和使用原则：按规则发放，按无意义码使用。
