胰岛素最主要的副作用是（）

A.过敏性休克

B.血管神经性水肿

C.荨麻疹

D.皮下脂肪萎缩

E.低血糖

Sequential circuit is a common logic device whose output values, at a given instant, depend upon its input values and the internal state at that instant, and whose internal state depends upon the (66) preceding input values and the preceding internal state. A sequential circuit can assume a finite number of internal states and may therefore be regarded, from an abstract (67) , as a finite (68) .

Combinational circuit is another logic device whose output values, at any given instant, depend upon the input values at that instant. A combinational circuit is a (69) of a sequential circuit whose internal state is not taken (70) .

（67）处填（）。

A．idea

B．observation

C．point of view

D．viewport