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The suction - force principle of operation is a typical char

题目
单选题
The suction - force principle of operation is a typical characteristic of （）.
A

centrifugal pumps

B

jet pumps

C

propeller pumps

D

reciprocating pumps

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相似问题和答案

第1题：

Which two valid declarations of a char？ （）

  • A、 Char ch = “a”；
  • B、 Char ch = ‘“‘ ‘；
  • C、 Char ch = ‘cafe‘；
  • D、 Char ch = “cafe”；
  • E、 Char ch = ‘“ucafe‘；
  • F、 Char ch = ‘“u10100‘；
  • G、 Char ch = （char） true；

正确答案:B,E

第2题：

A network administrator needs to force a high-performance switch that is located in the MDF to become the root bridge for a redundant path switched network. What can be done to ensure that this switch assumes the role as root bridge（）。

  • A、Establish a direct link from the switch to all other switches in the network.
  • B、Assign the switch a higher MAC address than the other switches in the network have.
  • C、Configure the switch so that it has a lower priority than other switches in the network.
  • D、Configure the switch for full-duplex operation and configure the other switches for half-duplex operation.
  • E、Connect the switch directly to the MDF router, which will force the switch to assume the role of root bridge.

正确答案:C

第3题：

加速原理 Accelerator principle


参考答案：

解释产出率变动同方向地引致投资需求变动的理论。


第4题：

单选题
The static suction lift of a pump is the difference in elevation between the （）.
A

centerline of the pump and the level of the liquid in the suction well when the source of liquid is below the pump

B

centerline of the pump and the suction liquid level when the source of liquid is above the pump

C

centerline of the pump and the level of the discharge liquid

D

liquid levels of the suction and discharge


正确答案： C
解析： 暂无解析

第5题：

单选题
Which expression has the different meaning from entry into force ? “entry into force” means is（）.
A

coming into effect

B

moving to full effect

C

being based on force

D

coming into force


正确答案： B
解析： 暂无解析

第6题：

选择适当的用语补充对话。（） ——What did you feel during the massage？ ——I am feel comfortable____________.

  • A、The force is too heavy
  • B、The force is too big
  • C、The force is too light
  • D、The force is too suitable

正确答案:D

第7题：

单选题
Which of the following statements is correct with regards to the operation of a centrifugal cargo pump?（）
A

Oil is discharged from the impeller through the outlet

B

Gravity causes the oil to flow toward the discharge

C

The self-priming feature of the centrifugal pump enables it to draw its own suction as it starts

D

The discharge capacity varies directly with the speed of the impeller


正确答案： C
解析： 暂无解析

第8题：

If the suction pressure at the refrigeration compressor is below normal, the cause can be

A.refrigerant overcharge

B.overfeeding by the expansion valve

C.a restricted suction strainer

D.due to short cycling of the compress


正确答案：C

第9题：

单选题
Which of the listed operations will cause an automatically controlled refrigeration compressor to restart?（）
A

Closing of the solenoid valve

B

Closing of the expansion valve

C

An increase in the suction pressure

D

Decreasing the suction pressure


正确答案： B
解析： 暂无解析

第10题：

单选题
A pump is said to have "negative suction head" when the pump is located （）.
A

between the suction and discharge

B

below the liquid supply

C

above the liquid supply

D

any of the above


正确答案： C
解析： 暂无解析

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