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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

报纸的规格有（）和（）两种。

哪些用电执行商业电价？

ESL乳

搅拌站设置的原则是（）。

A.搅拌站应有后上料场地

B.搅拌站尽可能设置在垂直运输机械附近

C.搅拌站场地四周应当设置沉淀池、排水沟

D.搅拌站应挂设操作规程、安全标志、混凝土配合比牌等

E.搅拌站应搭设防护棚