计算机中总线有（）种。
A.1
B.2
C.3
D.4
参考答案：C
It can not be a(n) ___that four jewellery stores were robbed in one night.
A．coincidence
B．accident
C．incident
D．chance
下面那些参数是混杂参数（）
A.k
B.α
C.β
D.γ
E.Kn
