盲肠癌，直径3cm，手术术式应选择（）

A.左半结肠切除术

B.右半结肠切除术

C.全结肠切除术

D.部分结肠切除术

E.经内镜切除术

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) .

（69）处填（）。

A．counterexample

B．specification

C．particular

D．special case