单项选择题
Which of the following should be recorded in Oil Record Book Part I (machinery space operation) ?（）
A.Non automatic discharge overboard of machinery space bilge water B.Automatic discharge overboard of machinery space bilge water C.A and B D.Neither A nor B
单项选择题 A ruptured diaphragm in a thermostatic expansion valve will cause the valve to （）.
单项选择题 Black smoke coming from a boiler can be caused by （）.
单项选择题 Which will cause the high pressure cutout to stop the compressor in a R-22 system?（）
