化工用泵拆卸时有哪些注意事项?

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问题:

化工用泵拆卸时有哪些注意事项?

考点:化工机械检修技术考试化工机械检修技术考试题库
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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.sharing

B.excluding

C.omitting

D.ignoring

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写出209T型转向架的垂直力传导顺序。

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中国营养学会2000年提出硒的RNI值和UL值与下列数值对应的为()ug

A.50

B.55

C.100

D.400

E.450

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我国历史上最早的统计法律,始见于( )。

A.夏朝

B.周朝

C.汉朝

D.宋朝

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根据《注册造价工程师管理办法》的规定,前一个注册期内造价工程业绩达不到规定标准或未办理暂停执业手续而脱离工程造价业务岗位的情形,应( )。

A.延续注册

B.变更注册

C.不予注册

D.撤销注册

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