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【单选题】
The human being longs for a sense of being accomplished, of being able to do things, with his hand, with his mind, with his will. Each of us wants to feel he or she has the ability to do【1】that is meaningful and that serves as a【2】to our inherent abilities. It is easiest to see this【3】the craftsman who lovingly shapes some cheap material into an object that may be either useful or beautiful or【4】. You can see the carpenter or bricklayer stand aside and【5】the product of his personal skill. But even【6】there is no obvious end product that is【7】attributable to one person's skill, researchers have found that employees find pride in accomplishment. Our own research in hospitals suggests that【8】the housekeeping and laundry staffs take pride in the【9】that in their own ways they are helping to cure sick people--and thus accomplishing a good deal. We're often misled by the complaints【10】difficult work; deep【11】most people regard their own capacity to conquer the tough job as the mark of their own unique【12】Complaining is just【13】of working. After all, how【14】do you know who you are, except as you can demonstrate the ability of your【15】to control you limbs and hands and words? You are,【16】significant measure, what you can do. Some are deceived into thinking that people like to store up【17】, to rest and save【18】as much as possible. Just the【19】. It is energy【20】that is satisfying. (1)
A.
one thing
B.
something
C.
work
D.
a job
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A.
进气迟后角与排气提前角之差
B.
进气提前角与排气迟后角之差
C.
进气迟后角与排气提前角之和
D.
进气提前角与排气迟后角之和
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A.
双作用液压缸
B.
单作用液压缸
【单选题】气门重叠角是指 ( )之和。
A.
进气提前角与排气提前角;
B.
进气提前角与排气延迟角
C.
排气提前角与进气延迟角
D.
排气提前角与排气延迟角
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