根据《中国移动集团客户及宽带接入（客户侧）工程施工工艺标准》，机架安装后各直列上、下两端垂直倾斜误差应不大于（）。

A.3mm

B.4mm

C.5mm

D.6mm

Under what circumstances shall the Customs lift the seal affixed to the account books, documents and relevant data without delay

A．Falsifying relevant account books, documents where any possibility is detected of .transferring

B．Upon clearance of a case

C．Upon completion of collecting necessary evidence

D．Both B and C