搜题

【单选题】

Which of the following pumps will build up a bursting pressure or stall their motors if the discharge valves are closed?（）<br /> (1) gear<br /> (2) centrifugal<br /> (3) screw

A、（1）and（2）

B、（1），（2）and（3）

C、（1）and（3）

D、（2）and（3）

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更多“ Which of the following pumps will build up a bursting pressure or stall their motors if the discharge valves are closed?（）<br /> (1) gear<br /> (2) centrifugal<br /> (3) screw”相关的问题

第1题

[] Which of the following may hardness of the boiler water cause?（） (1) scale formation (2) tube failure (3) corrosion Which of the following may hardness of the boiler water cause?（） (1) scale formation (2) tube failure (3) corrosion

A、A.（1）and（2） B、B.（1）and（3） C、C.（2）and（3） D、D.（1），（2）and（3）

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第2题

[] When a hydraulic vane pump is working, which of the following is in contact with the vanes?（） (1) the rotor (2) the internal surface of the housing (3) the external surface of the housing When a hydraulic vane pump is working, which of the following is in contact with the vanes?（） (1) the rotor (2) the internal surface of the housing (3) the external surface of the housing

A、A.(1) only B、B.(2) only C、C.(1) and (2) D、D.(1), (2) and (3)

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第3题

[单选题] Which of the following item is the cause to the damage of parts and excess wearing?（）

A、overload B、the odds of the load C、the default of parts D、overload and the odds of the load

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第4题

[] The ways in which words follow one another and are related to one another is called the syntagmatic dimension of language, the dimension of “chaining” or “sequencing”.（）

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第5题

[单选题] Which of the following influences the position of the interface between the liquid seal and the oil in a purifier?（）

A、Height of the machine B、Temperature of the liquid seal C、Gravity disc D、Bowl diameter

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第6题

[单选题] Which of the following influences the position of the interface between the liquid seal and the oil in a purifier?（）

A、Height of the machine B、Temperature of the liquid seal C、Gravity disc D、Bowl diameter

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第7题

[单选题] Which of the following may take place if the clearance of the main bearings are excessive?（）

A、bearing knocks B、dropping of pressure of LO C、noises D、all the above

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第8题

[单选题] Which of the following will take place if the clearance of the main bearings are excessive?（）

A、bearing knocks B、dropping of pressure of LO C、noises D、all the above

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第9题

[单选题] Which of the following can be obtained by means of an indicator card?（）

A、the peak pressure in a cylinder B、the temperature of the cooling water C、the fuel consumption D、none of the above

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第10题

[单选题] Which of the following can be obtained by means of an indicator card?（）

A、the peak pressure in a cylinder B、the temperature of the cooling water C、the fuel consumption D、none of the above

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