此题为多项选择题。
第1题
Heat damage to fuel injection nozzles can be prevented by avoiding ____.
A.excessive fuel oil temperature
B.long periods of engine overload
C.metallic contact between nozzles and cylinder heads
D.hard carbon deposit and varnish on the nozzles
第2题
A.Brass
B.Copper
C.Lead
D.Zinc
第3题
The circular steel structure installed around the propeller of a towboat is the______.
A.nozzle
B.shroud
C.strut
D.Hood
第4题
第5题
A Kort nozzle is a(n) ______.
A.hollow tube surrounding the propeller used to improve thrust
B.nozzle attached to a firefighting hose
C.intake valve on a diesel engine
D.piston cylinder on a diesel engine
第6题
The four propellers are fitted horizontally to the Eagle.
A.Right
B.Wrong
C.Not mentioned
第7题
A.Sunday morning, 11 o'clock.
B.Thursday morning, around 10 o'clock.
C.Friday morning, around 10 o'clock.
D.Monday morning, 11 o'clock
第8题
A.Sunday morning, 11 o'clock.
B.Thin, day morning, around 10 o'clock.
C.Friday morning, around 10 o'clock.
D.Monday morning, 11 o'clock
第9题
A.fixed pitch propellers
B.uncontrollable pitch propeller
C.constant pitch propellers
D.variable pitch propellers
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