题目内容（请给出正确答案）

[主观题]

The presence of air in the condenser of a refrigeration system will _____ the condensing p

ressure.

A.increase

B.reduce

C.maintain constant

D.None of the above is true

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更多“The presence of air in the con…”相关的问题

第1题

______, particularly the oxides of sulfur, greatly increases the rate at which rust forms.

A．The presence of air pollutants

B．Air pollutants are present

C．Because the presence of air pollutants

D．Air pollutants whose presence

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第2题

Air pollution refers to the presence of all the following EXCEPT______.A．harmful solidsB．h

Air pollution refers to the presence of all the following EXCEPT______.

A．harmful solids

B．harmful gases

C．harmful liquids

D．harmful chemicals

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第3题

By "physical environment" （Line 2, Paragraph 2), the writer means such elements as ______.

By "physical environment" (Line 2, Paragraph 2), the writer means such elements as ______.

A．the position of military troops

B．the presence of minicomputers

C．the strength of radio signals

D．the amount of water vapor in the air

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第4题

The speed of an ocean current is dependent on （).A.the density of the waterB.the air tempe

The speed of an ocean current is dependent on ().

A.the density of the water

B.the air temperature

C.the presence of a high pressure area near it

D.underwater soil conditions

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第5题

The process by which carbon dioxide and oxygen are transferred does not depend on_______.A

The process by which carbon dioxide and oxygen are transferred does not depend on_______.

A．the presence of nitrogen in the blood

B．the muscles of the thoracic cavity

C．the flow of blood

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第6题

According to paragraph 3,proponents of spontaneous generation believed that which of the f

ollowing was important for the process to succeed ？

A．A sealed container

B．Fresh air

C．Heat

D．The presence of nutrients

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第7题

The process by which carbon dioxide and oxygen are transferred does not depend on ______.A

The process by which carbon dioxide and oxygen are transferred does not depend on ______.

A．the presence of nitrogen in the blood

B．the muscles of the thoracic cavity

C．the flow of blood

D．the moisture in the air sac linings

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第8题

By "physical environment"（Line 2, Paragraph 2), the writer means such elements as______.A．

By "physical environment"(Line 2, Paragraph 2), the writer means such elements as______.

A．the position of military troops

B．the presence of minicomputers

C．the strength of radio signals

D．the amount of water vapor in the air

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第9题

A combustible gas indicator is used to determine _____.A.if there is sufficient oxygen to

A combustible gas indicator is used to determine _____.

A.if there is sufficient oxygen to support life

B.the toxicity of flammable gases or vapors

C.the amount of CO2 present in flue gas

D.the presence of flammable gases or vapors in the air

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