单项选择题
When air becomes trapped in the hydraulic fluid of a steering system, the （）.
A.rudder will respond sluggishly B.hydraulic rams will over-speed C.sight glass will show bubbles D.ram relief valves will lift
单项选择题 If a refrigeration system were short of refrigerant, the condition would result in （）.
单项选择题 Condensate must be drained from the intercooler and after-coolers of an air compressor because （）.
单项选择题 In the refrigeration system, a shortage of refrigerant is indicated by （）.
