（）协助完成用户的呼叫和业务操作。
A.MSC
B.HLR
C.VLR
D.AuC
参考答案：B
_________ the traffic jam yesterday, only few students were late for the class. [ ]
A. Although
B. In spite of
C. Due to
D. Because of
如图所示梁的剪力方程应分几段来表述？（）
A.4
B.3
C.2
D.5
