血栓头部一般属于A．白色血栓 B．红色血栓 C．透明血栓 D．混合血栓 E．延续性血

Why is(71)fun What delights may its practitioner espect his reward First is the sheer joy of making things.As the child delights in his mud pie,so the adult enjoys building things,especially things of his own design.Secong is the pleasure of making things that are useful to other people.Third is the fascinanon of fashioning complex puzzle-like objects of interlocking moving parts and watching them work in subtle eyeles,playing out the consequences of principies built in from the beginning.Fourth is the joy of always learning,which springs from the(72)nature of the task.In one way or another the problem is ever new,and its solver learns something:sometimes(73),sometimes theoretical,and sometimes both.Finally,there is the delight of working in such a tractable medium.The(74),like the poet,works only slightly removed from nure thought-stuff.Few media of ereation are so flexible,so easy to polish and rework,so readily capable of realizing grand conceptual structures. Yet the program(75),unlike the poet’s words,is real in the sense that it moves and works,producing visible outputs separate from the comstrct itself.It prints results,draws pictures,produces sounds,moves arms.Progamming then is fun because it gratifies creative longings built deep within us and delights sensibities we have in common with all men.

（75）处填（）。

A．construct

B．code

C．size

D．scale

某医疗机构发现一例传染性非典型肺炎，该医疗机构应该在多长时间内向疾病预防控制机构报告（）

A.2小时

B.6小时

C.12小时

D.24小时

E.48小时

属于闭合伤的是（）。

A.擦伤

B.火器伤

C.刺伤

D.关节脱位

E.撕脱伤

免征额是指对征税对象总额中免予征税的数额。即将纳税对象中的一部分给予减免，只就减除后的剩余部分计征税款。

唇膏中油性基质包括油，脂，（），是唇膏的主体，含量约占90％，对于唇膏的性质起重要的作用。

A.蜡

B.凡士林

C.蓖麻油

D.羊毛脂