单项选择题
A.machine efficiency B.machinery efficiency C.mechanical efficiency D.mechanics efficiency
Charging is the filling of the engine cylinder with a s...
单项选择题Charging is the filling of the engine cylinder with a supply or charge of fresh air （） compression.
A.to need B.ready for C.want to D.going to be
单项选择题Charging is the filling of the engine cylinder with a supply of （） for compression.
A.water B.fresh air C.fuel oil D.gas
Cast iron carrier rings, （） machined grooves, are provi...
单项选择题Cast iron carrier rings, （） machined grooves, are provided for all the pistons.
A.caulked into B.caulking into C.pressed into D.screwed into
