单项选择题
A.the starting air distributor
B.the cut-off valve on the air main
C.the main starting valve
D.the air bottle control valve
单项选择题 Suppose the rated capacity of the main engine of a ship is 10,000 KW at 100 rated rpm, then when at 80 rpm its capacity should be （）.
单项选择题 Cylinder wall temperature, fuel oil supplier, and oil passage （）.
单项选择题 The development of oils （） the increasing demands made by the steady rise in powers produced by modem diesels.