问题：
[单选] After "F.W.E" is given, the air system is shut down, the （） gear put in, all drains and indicator cocks opened, and the cooling water kept running.
steering。timing。turning。running。
问题：
[单选] After ensuring that the （） is correct the bearing clearance should be checked.
nap。gap。nip。deflectio。
问题：
[单选] After fitting back in place the gear wheels, dont forget （） them.
to grease。greasing。oiling。lubricating。
问题：
[单选] After passing through the turbine the exhaust gas is conducted out into the（）.
intercooler。compressor。cylinder。open air。
问题：
[单选] After the engine is warned, we should（） the turning gear before starting up the engine.
take in。put in。take out。put u。
问题：
[单选] After the order “（）” is given, the air system is shut down, the turning gear put in.
Finished with Engine。Stop the Engine。Stand-by Engine。Slow-down Engine。
问题：
[单选] Air cocks, usually positioned at the （） in a circulating system, is used to get rid of the air in the system.
bending joint。expansion tank。weld。the highest point。
问题：
[单选] All the rings are slightly rounded on their external top and bottom edges to keep the oil film on the cylinder liner during （） for new piston rings.
the running-in period。the running process。gas exchange process。the boiler firing。
问题：
[单选] All three systems have the ports （） to swirl the incoming air and direct it in the appropriate path.
angled。rounded。being angled。being rounded。
问题：
[单选] Aluminum pistons have （） coefficient of thermal expansion compared with those of cast iron.
higher。lower。the same。none of the above。
