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问题 单项选择题

用介损仪反接线测量小电容量试品（＜50PF）的介损tgδ及Cx时，在附近处有物体（如梯子等）情况下测得的电容值较物体拆除拆除后测得的电容值（）。

A.大

B.相等

C.小

D.以上均不是

答案

参考答案：A

单项选择题 A1型题

在诊断方法确定之后，其诊断结果的阳性预测值取决于（）

A.特异度

B.敏感度

C.似然比

D.患病率

E.以上都不是
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单项选择题

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. Butwhen it has not set in two minutes, the customer has two choices--waits or eats it raw. Software customers have had (116) choices.
Now I do not think software (117) have less inherent courage and firmness thanchefs, nor than other engineering managers. But false (118) to match the patron’s desireddate is much more common in our discipline than elsewhere in engineering. It is very (119) 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 (120) 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．no

B．the same

C．other

D．lots of
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