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问题 单项选择题 A1/A2型题

使蛋白质分子在280nm具有光吸收的最主要成分是（）

A.丝氨酸的羟基

B.半胱氨酸的巯基

C.苯丙氨酸的苯环

D.色氨酸的吲哚环

E.组氨酸的咪唑环

答案

参考答案：D

单项选择题

HPV的重要意义在于（）

A.肺内分流增加，加重低氧血症

B.肺内分流增加，减轻低氧血症

C.肺内分流减少，减轻低氧血症

D.肺内分流减少，加重低氧血症

E.肺血管扩张，肺血流量增加
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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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