单项选择题
The function of the hydraulic telemotor transmitter used in an electro-hydraulic steering gear system is to （）.
A.transmit the rudder angle to the bridge indicator B.prevent the control linkage from striking the stops when hard over C.automatically purge all entrained air from the system D.send hydraulic signals to the receiving unit
单项选择题 To obtain maximum efficiency, two stage air compressors are usually （）.
单项选择题 Which of the following statements is true concerning the overall efficiency of air compressors?（）
单项选择题 The ability of an oil to separate cleanly from an oil and water mixture is referred to as its （）.
