单项选择题
When the refrigeration demand is small,（）
A.the expansion valve will move toward the wide open position
B.the expansion valve will move toward the closing position
C.the feeler bulb will conveys the high temperature
D.the superheat degree will raise
点击查看答案&解析
相关考题
-
单项选择题
When the heat load begins to increase, the needle valve of an expansion valve will（）
A.move in an opening direction
B.move in a closing direction
C.either open or close
D.not move at all -
单项选择题
One of the main purposes of refractories in a boiler furnace is to（）
A.help preheat the air for the furnaces
B.help preheat the feedwater
C.protect economizer from excessive heat
D.prevent excessive furnace heat losses -
单项选择题
What is the first thing you would check on taking over a watch?（）
A.the bilges
B.the periscope
C.the water level
D.the oil pressure
