Before liquid can flow into a pump, the air in the suction line must be （） sufficiently to cause the liquid to flow into the suction chamber...

第1题

[单选题] The flash point of a liquid refers to the temperature （）

A、at which a liquid will give off inflammable vapors B、at which a liquid will burn steadily C、at which a liquid will explode D、that a liquid must reach before it will flow readily

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第2题

[] Which of the following pumps are self-priming, and can deal with liquid from a level below the pump（） (1) ejector (2) screw (3) centrifugal Which of the following pumps are self-priming, and can deal with liquid from a level below the pump（） (1) ejector (2) screw (3) centrifugal

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

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第3题

[] Which of the following pumps are self-priming, and can deal with liquid from a level below the pump: （） (1)reciprocating (2)vane (3)gear Which of the following pumps are self-priming, and can deal with liquid from a level below the pump: （） (1)reciprocating (2)vane (3)gear

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

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第4题

[] What is the substance called which can readily be converted from a liquid into a vapor, and also from a vapor into liquid with a reasonably narrow range of pressure?（）

A、A.Refrigerator B、B.Refrigerant C、C.Cooling medium D、D.Brine

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第5题

[单选题] A petroleum liquid has a flashpoint of 85℃.This liquid is in IMDG Code classed as a（）.

A、flammable liquid B、nonflammable liquid C、inflammable liquid D、disflammable liquid

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第6题

[单选题] A petroleum liquid has a flashpoint of 85°C . This liquid is in IMDG code classed as a（）.

A、flammable liquid B、nonflammable liquid C、inflammable liquid D、disflammable liquid

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第7题

[单选题] A petroleum liquid has a flash point of 135°Fahrenheit. This liquid is classed as a grade （）.

A、B flammable liquid B、C flammable liquid C、D combustible liquid D、E combustible liquid

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第8题

[单选题] A petroleum liquid has a flash point of 85°F. This is a grade （）.

A、B flammable liquid B、C flammable liquid C、D combustible liquid D、E combustible liquid

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第9题

[单选题] Regular foam can be used on all but which flammable liquid?（）

A、Motor gasoline B、Jet fuel C、Crude petroleum D、Alcohol

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Before liquid can flow into a pump, the air in the suction line must be （） sufficiently to cause the liquid to flow into the suction chamber.

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