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【单选题】
如图所示液压系统的液压泵在20°C时供给50L/min的液压油,液压油的运动粘度ν=200×10 m /s,密度ρ=900kg/m ,吸油管道内径d=30mm,l=4m,泵进油口截面在液压油自由表面下0.8m处,如果局部压力损失忽略不计,试计算液压泵进油口处的绝对压力是多少?
A.
59000Pa
B.
63000Pa
C.
69000Pa
D.
72000Pa
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参考答案：
举一反三
【判断题】一个论证是三段论,其中包含了三个标准形式,其中,一个为前提,两个为结论。
A.
正确
B.
错误
查看完整题目与答案
【多选题】影响货币政策效应的因素有( )。
A.
微观主体的对消作用
B.
政策透明度和公信度
C.
内部时滞和外部时滞
D.
货币流通速度
查看完整题目与答案
【简答题】All the people who went to the new supermarket had one great hope: to be the lucky customer who did not have to pay for his shopping . For this was what the notice just inside the entrance promise It ...
查看完整题目与答案
【单选题】镗削精度高的孔时,精镗应在粗镗后工件的温度达到( )后进行。
A.
热伸长
B.
热平衡
C.
热变形
D.
热膨胀
查看完整题目与答案
【简答题】All the housewives who went to the new supermarket had one great ambition: to be the lucky customer who did not have to pay for her shopping. For this was what the notice just inside the entrance prom...
查看完整题目与答案
【单选题】One reason why the woman of today may take a job is that she __________ 查看材料
A.
is younger when her children are old enough to look after themselves
B.
does not like children herself
C.
needn't worry about food for her children
D.
can be free from family duties when she reaches sixty
查看完整题目与答案
【多选题】根据我国《建设工程施工合同》(示范文本)规定,工程师是指( )。
A.
承包人委派的项目经理
B.
监理单位委派的总监理工程师
C.
设计单位委派的施工现场代表
D.
发包人指定的履行合同的负责人
E.
设备供应单位委派的技术负责人
查看完整题目与答案
【简答题】影响货币政策效应的因素有。
查看完整题目与答案
【简答题】All the housewives who went to the new supermarket had one great ambition: to be the lucky customer who did not have to pay for her shopping. For this was what the notice inside the entrance promised....
查看完整题目与答案
【单选题】镗削精度高的孔时、精镗应在粗镗后工件温度达到( )后进行。
A.
热伸长
B.
热平衡
C.
热变形
D.
热膨胀
查看完整题目与答案
相关题目：
【判断题】一个论证是三段论,其中包含了三个标准形式,其中,一个为前提,两个为结论。
A.
正确
B.
错误
查看完整题目与答案
【多选题】影响货币政策效应的因素有( )。
A.
微观主体的对消作用
B.
政策透明度和公信度
C.
内部时滞和外部时滞
D.
货币流通速度
查看完整题目与答案
【简答题】All the people who went to the new supermarket had one great hope: to be the lucky customer who did not have to pay for his shopping . For this was what the notice just inside the entrance promise It ...
查看完整题目与答案
【单选题】镗削精度高的孔时,精镗应在粗镗后工件的温度达到( )后进行。
A.
热伸长
B.
热平衡
C.
热变形
D.
热膨胀
查看完整题目与答案
【简答题】All the housewives who went to the new supermarket had one great ambition: to be the lucky customer who did not have to pay for her shopping. For this was what the notice just inside the entrance prom...
查看完整题目与答案
【单选题】One reason why the woman of today may take a job is that she __________ 查看材料
A.
is younger when her children are old enough to look after themselves
B.
does not like children herself
C.
needn't worry about food for her children
D.
can be free from family duties when she reaches sixty
查看完整题目与答案
【多选题】根据我国《建设工程施工合同》(示范文本)规定,工程师是指( )。
A.
承包人委派的项目经理
B.
监理单位委派的总监理工程师
C.
设计单位委派的施工现场代表
D.
发包人指定的履行合同的负责人
E.
设备供应单位委派的技术负责人
查看完整题目与答案
【简答题】影响货币政策效应的因素有。
查看完整题目与答案
【简答题】All the housewives who went to the new supermarket had one great ambition: to be the lucky customer who did not have to pay for her shopping. For this was what the notice inside the entrance promised....
查看完整题目与答案
【单选题】镗削精度高的孔时、精镗应在粗镗后工件温度达到( )后进行。
A.
热伸长
B.
热平衡
C.
热变形
D.
热膨胀
查看完整题目与答案
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