For the proper control of the air temperature in an air conditioning system using chilled water circulation, which of the listed conditions should remain constant regardless of load changes?（）
1、The value of the controlled variable,
The value of the controlled variable, which under any fixed set of conditions the automatic controller operates to maintain, is known as （）Aset pointBcontrol pointCdeviationDoffset
2、which of the following is the proper p
which of the following is the proper pronunciation of “have to “ as a result of assimilation?A／hef tu／B／hev tu／C／hæf tu／D／hæv tu／
3、What is the disadvantage for air trans
What is the disadvantage for air transportation? （）A Quick but not safeB Less frequencyC It can’t lift heavy goodsD The highest cost in all transport modes
4、The air required for combustion is tak
The air required for combustion is taken from the engine room through a filter fitted on the turbochargerThis reduces the risk for too and contamination of the combustion air（）Ahigh temperaturesBlow temperaturesCwetDdirty
5、（）is the disadvantage for air transpor
（）is the disadvantage for air transportation?A Quick but not safeB Less frequencyC It can’t lift heavy goodsD the highest cost in all transport modes
6、What is the disadvantage for air trans
What is the disadvantage for air transportation?（）AQuick but not safeBLess frequencyCIt can’t lift heavy goodsDThe highest cost in all transport modes