单项选择题
A.nuts B.bolts C.coil springs D.stuffing boxes
The scavenging box is built of a number of sections pro...
单项选择题The scavenging box is built of a number of sections provided with vertical flanges enabling them （） together to form two blocks.
A.being bolted B.bolted C.bolting D.to be bolted
The scavenging air ports are located at （） that they ar...
单项选择题The scavenging air ports are located at （） that they are just exposed by the upper edge of the piston when the piston is in the bottom dead center position.
A.so a height B.such a height C.so high D.such high
The rising of the exhaust temperature in manifold pipe ...
单项选择题The rising of the exhaust temperature in manifold pipe may NOT result from （）.
A.too great a loading B.fouled turbocharger C.bad combustion D.excessive air
