搜题

【单选题】

Too much air in the furnace of an oil-fired boiler would be indicated by （）.

A、yellowish flame

B、golden yellow flame

C、white flame

D、brilliant white flame

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更多“Too much air in the furnace of an oil-fired boiler would be indicated by （）.”相关的问题

第1题

[单选题] Too much excess air is （）because the heat generated is being lost through the exhaust trunking instead of being made used of in heating the water to produce steam.

A、not good B、good C、better D、the best

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第2题

[判断题] If the teacher were talking too much in class the students would not be learning.（）

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第3题

[单选题] Under normal conditions, the quantity of air circulation becomes less and less.What is the reason?（）

A、dirty delivery ducts B、too much refrigerant C、the fouling filters D、high temperature outside

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第4题

[单选题] There is too much water in the fuelIt doesn’t （） to the specifications.

A、come from B、come in C、come out D、come up

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第5题

[单选题] Crankcase sweating in a refrigeration system is caused by （）.

A、a stuck solenoid valve B、a shortage of refrigerant C、too much oil in circulation D、too much superheat

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第6题

[单选题] One of the serious weaknesses in American economy in the 1920s was（）

A、uncontrolled speculation in the stock market B、tariff protection C、huge profits of big businesses D、too much control over the banking system

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第7题

[单选题] If the engine does start on air, but combustion does not immediately begin, the cause may be （）.

A、failure of the fuel pumps B、starting air pressure too low C、stop valve in air line closed D、the turning gear still engaged

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第8题

[单选题] Which of the following may cause that excessively warm water leaves the condenser in a refrigeration plant? （） (1) too little cooling water (2) too much cooling water (3) too warm cooler water

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

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第9题

[单选题] The country has（）too many wars in the past few decades；its people are longing for peace so much.

A、prevented from B、resulted in C、gone through D、gone with

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