什么是三一律？

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

能利尿通淋散瘀止血，且宜于血淋的药为

A．茯苓
B．滑石
C．寒水石
D．琥珀
E．萆薢

球罐要求进行基础沉降观测，主要观测的阶段是( )。

A．充水前

B．充水到1/3、2/3球缸本体高度时

C．充满水24小时及放水后

D．充水到1/2球缸本体高度

患者女性，30岁，因“血尿20余日”来诊。患者无明显诱因出现血尿，排尿时 * * 口灼热感，尿中无血块，伴发热，体温最高39℃，腰痛、恶心、呕吐。既往体健，否认有高血压、糖尿病史。实验室检查：血常规示中性粒细胞0.80；尿常规示尿白细胞（+++），尿潜血（+++）；粪常规、肝功能、肾功能、心电图均正常。尿培养变形杆菌，对多种抗感染药物敏感。影像学检查：腹部CT示双肾多发结石、双肾积水。诊断：双肾多发结石、双肾积水。

若拟行双肾经皮肾镜碎石取石术，由于患者有青霉素过敏史，可以作为泌尿系统围术期预防用药的抗感染药物是（）

A.头孢呋辛

B.阿米卡星

C.阿奇霉素

D.环丙沙星

E.左氧氟沙星

火控系统最先采用计算机的坦克炮是什么炮（）

A.美国M68式105毫米坦克炮

B.法国“勒克莱尔”120毫米滑膛坦克炮

C.苏联2A46式125毫米滑膛坦克炮

D.美国M81式152毫米坦克炮