【1】 是指反映数据元素之间逻辑关系的数据结构。

兴奋性突触后电位的产生，是由于突触后膜提高了对下列哪种离子的通透性（）

A.Ca²⁺、K⁺，尤其是Ca²⁺

B.Cl^-、K⁺，尤其是K⁺

C.K⁺、Na⁺、Cl^-

D.Na⁺、Cl^-，尤其是Na⁺

E.Na⁺、K⁺，尤其是Na⁺

单缸四行程发动机在作功行程开始时，进、排气门的状态是（）。

A.进气门关闭，排气门打开

B.排气门关闭，进气门打开

C.进气门关闭，排气门关闭

D.进气门打开，排气门打开

适宜采用硬化注射疗法的是（）

A.内痔

B.外痔

C.肛 * * 肥大

D.肛瘘

E.锁肛痔

A typical (66) language contains an applicative sub-language which approximates the mathematical abstractions of "timeless" functions applied to "spaceless" values, where the actual operation sequences and use of storage space during expression evaluation are organized behind the (67) . In this setting, values are data structures of low volume, typically a few computer words or less, which means that an illusion of spacelessness can be realized by having (68) results during expression evalution stored at the discretion of the language implementation, and effecting parameter (69) and (70) operations through value copying.

66（）

A．imperative

B．mandatory

C．compulsory

D．voluntary

简述特别累犯与一般累犯的区别。