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【单选题】
如图所示液压系统,两个减压阀分别为串联和并联,已知减压阀的调整压力 P J1 =3.5MPa , P J2 =2MPa ,溢流阀的调整压力 P Y =4.5MPa ,活塞运动时要克服的外负载 F=1.5KN ,活塞无杆腔面积 A=15cm 2 ,不计一切损失,问活塞运动时 A、B、C各点压力是( )。
A.
1MPa，1MPa，1MPa
B.
2Mpa，3.5 Mpa，4.5 Mpa
C.
3.5 Mpa，3.5 Mpa，4.5 Mpa
D.
其余选项都不是
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【判断题】在标准式本量利关系图中,当销售量变化时,会导致盈利三角区和亏损三角区同变
A.
正确
B.
错误
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【单选题】Mr. Smith was very disappointed to see the car he had had _____ went wrong again.
A.
to be repaired
B.
repaired
C.
it repaired
D.
it
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【判断题】通过技术革新使机车加工精度提高, 使电视 机的图象更加清晰等,这种技术进步 称为 技术革命。
A.
正确
B.
错误
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【单选题】His health failing, ______ last year.
A.
so the school gave Mr. Smith leave
B.
the school had given Mr. Smith leave
C.
so Mr. Smith went on leave from work
D.
Mr. Smith went on leave from work
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【判断题】采用净现值指标比选互斥方案时,判别准则是:净现值大于零且最大的方案为最优方案
A.
正确
B.
错误
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【单选题】After retirement, Mr. Smith ______ painting, which he had always loved but had not had time for.
A.
took up
B.
got up
C.
help up
D.
looked up
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【简答题】Mr. Smith worked in a big computer company. He had no wife, and of course, had no child, 41 . He lived in an old house 42 . He liked nothing but drinking. He almost spent all of his money 43 drinks. O...
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【判断题】采用净现值指标比选互斥方案时,判别准则为净现值最大且大于零的方案为最优方案。
A.
正确
B.
错误
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【单选题】Mr. Smith ______ that he had made a mistake and that he had corrected it.A．acceptedB．admittedC．ta
A.
4. Mr. Smith ______ that he had made a mistake and that he had corrected it. A．accepted
B.
admitted
C.
talked
D.
Promised
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相关题目：
【判断题】在标准式本量利关系图中,当销售量变化时,会导致盈利三角区和亏损三角区同变
A.
正确
B.
错误
查看完整题目与答案
【单选题】Mr. Smith was very disappointed to see the car he had had _____ went wrong again.
A.
to be repaired
B.
repaired
C.
it repaired
D.
it
查看完整题目与答案
【判断题】通过技术革新使机车加工精度提高, 使电视 机的图象更加清晰等,这种技术进步 称为 技术革命。
A.
正确
B.
错误
查看完整题目与答案
【单选题】His health failing, ______ last year.
A.
so the school gave Mr. Smith leave
B.
the school had given Mr. Smith leave
C.
so Mr. Smith went on leave from work
D.
Mr. Smith went on leave from work
查看完整题目与答案
【判断题】采用净现值指标比选互斥方案时,判别准则是:净现值大于零且最大的方案为最优方案
A.
正确
B.
错误
查看完整题目与答案
【单选题】After retirement, Mr. Smith ______ painting, which he had always loved but had not had time for.
A.
took up
B.
got up
C.
help up
D.
looked up
查看完整题目与答案
【简答题】Mr. Smith worked in a big computer company. He had no wife, and of course, had no child, 41 . He lived in an old house 42 . He liked nothing but drinking. He almost spent all of his money 43 drinks. O...
查看完整题目与答案
【判断题】采用净现值指标比选互斥方案时,判别准则为净现值最大且大于零的方案为最优方案。
A.
正确
B.
错误
查看完整题目与答案
【单选题】Mr. Smith ______ that he had made a mistake and that he had corrected it.A．acceptedB．admittedC．ta
A.
4. Mr. Smith ______ that he had made a mistake and that he had corrected it. A．accepted
B.
admitted
C.
talked
D.
Promised
查看完整题目与答案