下列禽流感病毒亚型中，已证实能感染人类的有（） A.H5N1 B.H7N1 C.H7

Observe that for the programmer, as for the chef, the urgency of the patron (顾客) may govern the scheduled completion of the task, but it cannot govern the actual completion. An omelette (煎鸡蛋) , promised in two minutes, may appear to be progressing nicely. But when it has not set in two minutes, the customer has two choices-waits or eats it raw. Software customers have had (71) choices.
Now I do not think software (72) have less inherent courage and firmness than chefs, nor than other engineering managers. But false (73) to match the patron’s desired date is much more common in our discipline than elsewhere in engineering. It is very (74) to make a vigorous, plausible, and job risking defense of an estimate that is derived by no quantitative method, supported by little data, and certified chiefly by the hunches of the managers.
Clearly two solutions are needed. We need to develop and publicize productivity figures, bug-incidence figures, estimating rules, and so on. The whole profession can only profit from (75) such data. Until estimating is on a sounder basis, individual managers will need to stiffen their backbones and defend their estimates with the assurance that their poor hunches are better than wish derived estimates.

A.testers B constructors C. managers D. architects

“诗存南渡后，入梦靖康前”本是对南宋偏安的伤感之词。20世纪30年代后期，文学家吴宓把自己的诗集取名为《南渡集》；历史学家陈寅恪也吟出了“南渡自应思往事”的诗句。文人的这一表白有可能是“暗喻”（   ）

A．对王明“左倾”路线的不满

B．对汪精卫投敌叛国的愤怒

C．对国民政府退守西南的失望

D．对国民党围剿红军的抗议

某高速公路，路面为沥青混凝土路面，基层为水泥稳定土基层，施工单位在基层施工中，出现以下情况： 

(1)由于本工程的路面属高级路面，所以采用水泥稳定细粒土做该路面的基层。 

(2)在选择水泥时，施工单位选择了终凝时间较短的水泥。 

(3)该工程采用集中场拌法施工，在设计水泥剂量时，按配合比试验确定的剂量时，按配合比实验确定的剂量增加1%的剂量来确定的。

(1)该工程采用水泥稳定细粒土做基层是否正确?说明理由。 (2)施工单位在选择水泥时是否正确，哪些水泥可做结合料? (3)设计水泥剂量的确定是否正确?如不正确，写出正确值。

根据《会计档案管理办法》的规定，会计档案的保管期限分为永久、定期两类。会计档案的定期保管期限最长的为( )。

A．10年

B．20年

C．30年

D．25年

顺序流式传输和实时流式传输有何区别？它们分别适用于哪些应用？