在奴隶社会、封建社会中，警察的职能是由军队、审判机关和行政官吏分别掌管的。( )

Lim provides printing services under the business name of AC Printing Services (AC). Lim had rented a unit from JTC Corporation (JTC) a year ago. The tenancy agreement included clause 21, which required the landlord ‘in every way to keep the building in good repair’.On 23 March 2011, large chunks of concrete broke off from the ceiling in the unit occupied by AC. Although no-one from AC was hurt in the incident, the chunks of concrete landed on two of AC’s printing machines and severely damaged the machines. Also, as the entire building had to be shut down for inspection by structural engineers, AC had to close for two weeks, resulting in numerous cancellations of their existing services as well as a loss of new deals. To make matters worse, AC was very close to signing a lucrative contract worth $30,000 with a well-known advertising agency which it then lost to a rival firm. Lim is extremely upset and wants to sue JTC.Required:Assuming JTC has breached the tenancy agreement, advise Lim as to:

(a) whether he can terminate the tenancy agreement, having regard to the nature of the term set out in clause 21 of the tenancy agreement; and (6 marks)

患儿男，4岁，因“误服‘洁厕灵’30min”来诊。患儿哭闹不安。查体：急性痛苦病容，口角流涎，T38.5℃，HR127次/min。急诊胸部X线片：心、肺未见异常。

该患儿初步诊断最正确的是（）

A.食管异物

B.食管酸性腐蚀伤

C.食管碱性腐蚀伤

D.食管穿孔

E.肺炎

经来量多，色鲜红或肾红，质稠粘，或有小血块，或有口渴心烦，尿赤便秘，舌红、苔黄，脉滑数，治以凉血清热止血，选方清经散。

烟草专卖生产企业许可证一律由国家烟草专卖局审核发放。

列车必须立即退行时应遵守哪些规定？