电缆孔洞的防火封堵，采用什么材料？

A company receives a payment of $10000 on 1 December, for rent on a property for December and January. On receipt, they correctly record it as cash and unearned revenue. If at 31 December, their year-end, they failed to make an adjustment entry related to this payment, what is the effect on the financial statements for the year（）

A. Assets are overstated by $5000 and liabilities are overstated by $5000.

B. Assets are overstated by $5000 and owner’s equity is overstated by $5000.

C. Liabilities are overstated by $5000 and owner’s equity is understated by $5000.

预防脐风最重要的措施是（）

A.孕妇勿感风邪

B.产妇勿感风邪

C.小儿生后避风

D.清洁断脐护脐

E.脐疮防其走黄

结核病最具特征的病变是（）

A.液化性坏死

B.结核性肉芽肿

C.浆液性炎

D.结核球

E.纤维化和空洞形成

ECDIS必须每分钟记录的信息有（）。

A.有效航向

B.ETA

C.对水速度

D.主机RPM

钢筋混凝土烟囱式塔有何特点？