單項選擇題All three systems have the ports () to swirl the incoming air and direct it in the appropriate path.

A.angled
B.rounded
C.being angled
D.being rounded


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1.單項選擇題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.

A.the running-in period
B.the running process
C.gas exchange process
D.the boiler firing

2.單項選擇題Air cocks, usually positioned at the () in a circulating system, is used to get rid of the air in the system.

A.bending joint
B.expansion tank
C.weld
D.the highest point

3.單項選擇題After the order “()” is given, the air system is shut down, the turning gear put in.

A.Finished with Engine
B.Stop the Engine
C.Stand-by Engine
D.Slow-down Engine

5.單項選擇題After passing through the turbine the exhaust gas is conducted out into the().

A.intercooler
B.compressor
C.cylinder
D.open air