单项选择题
A.stored in a common fuel line
B.pumped by the injection pump
C.at low pressure
D.already atomized
单项选择题 In conventional systems, the injection pressure（）, while it’s（）in common rail diesel engines.
单项选择题 The difference between Fixed pitch propeller (FPP) and Controllable pitch propeller (CPP) is in that（）
单项选择题 The propeller consists of a （）with several blades of helicoidal form attached to it.