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【单项选择题】

When a hydraulic vane pump is working, which of the following is in contact with the vanes?（）<br /> (1) the rotor<br /> (2) the internal surface of the housing<br /> (3) the external surface of the housing<p> When a hydraulic vane pump is working, which of the following is in contact with the vanes?（）<br /> (1) the rotor<br /> (2) the internal surface of the housing<br /> (3) the external surface of the housing</p>

A、A.(1) only

B、B.(2) only

C、C.(1) and (2)

D、D.(1), (2) and (3)

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更多“When a hydraulic vane pump is working, which of the following is in contact with the vanes?（）<br /> (1) the rotor<br /> (2) the internal surface of the housing<br /> (3) the external surface of the housing<p> When a hydraulic vane pump is working, which of the following is in contact with the vanes?（）<br /> (1) the rotor<br /> (2) the internal surface of the housing<br /> (3) the external surface of the housing</p>”相关的问题
第1题
[单选题] 广泛进行微生物研究的是1-7世纪70年代荷兰商人（）。

A、van Gogh  B、van Hoogenstyne  C、van Dyck  D、van Leeuwenhoek  

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第2题
[单选题] The hydraulic oil most likely to thin out when hot and thick when cold would have a viscosity index of（）

A、20  B、40  C、60  D、80  

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第3题
[单选题] When air becomes trapped in the hydraulic fluid of a steering system, the （）.

A、rudder will respond sluggishly  B、hydraulic rams will over-speed  C、sight glass will show bubbles  D、ram relief valves will lift  

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第4题
[单选题] The function of the hydraulic telemotor transmitter used in an electro-hydraulic steering gear system is to （）.

A、transmit the rudder angle to the bridge indicator  B、prevent the control linkage from striking the stops when hard over  C、automatically purge all entrained air from the system  D、send hydraulic signals to the receiving unit  

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第5题
[单选题] Most hydraulic steering gears are fitted with relief valves which（）

A、function when the rudder is amidships  B、relieve excess whip pressure from the hydraulic oil system  C、protect the piping assembly from external rudder shock  D、relieve excessive telemotor pressure  

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第6题
[单选题] In an electro-hydraulic steering gear system, when will the variable displacement pump be placed on stroke?（）

A、When the helm is at any angle other than amidships  B、When the six-way valve is opened  C、When the ram relief valves lift  D、When the redder angle is different from the position of the helm  

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第7题
[单选题] How can the chance of contaminating hydraulic fluid be decreased when working on hydraulic system?（）

A、clean the fittings before they are disconnected  B、Place drip pans under leaky fittings  C、Seal any cracks in lines with Permatex  D、Coat all threads with graphite oil  

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第8题
[简答题] 将van der Waals方程化成维里方程式；并导出van der Waals方程常数a、b表示的第二维里系数B的函数表达式。

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第9题
[单选题] Hydraulically, servo-operated, automatic, change over valves, utilized in a two ram hydraulic steering gear, serve to（）

A、allow an alternate main pump to start in the fully loaded condition thus developing immediate full torque  B、prevent either main pump from being hydraulically motored when idle by cross pressure flow  C、prevent both units from operating simultaneously which could result in doubling the flow of oil and pressure leading to over pressurization of the system  D、all of the above  

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