现行东莞失业保险缴费比例是多少？职工本人需要缴纳吗？

July was feeling a little blue because her mother _________ from her job and she had lots of bills to pay. [      ]

A. had laid off          

B. has been laid off

C. has laid off  

D. had been laid off

信号安全工作中“（）”是指信号设备失修、信号设备联锁失效、违章作业。

以下哪种物质不会引起中毒

A．工业性有毒物质

B．放射线

C．农药

D．药物

E．有毒动植物

机床导轨面经刮削后，只要检查其接触点数是否达到规定要求即可。

患者，女，25岁，以“下肢小腿结节性红斑、左膝关节肿痛2周”入院。入院后检查PPD皮试呈强阳性反应，胸CT检查肺内未见确切结核病灶。

该患者需加用小量激素治疗，预防性抗结核首选

A．异烟肼

B．利福平

C．链霉素

D．吡嗪酰胺

E．乙胺丁醇