单项选择题
The transmission system is the means （）the movement of the rudder is accomplished.
A.by which
B.to which
C.in which
D.at which
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Deck machinery, which is also known as hull machinery, includes all power driven equipment located （）the machinery spaces that is （） with the main propulsion plant.
A.inside；associated
B.inside；not associated
C.outside；associated
D.outside；not associated -
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In boilers, besides maintaining the burner atomizers, air diffuser vanes, fuel temperature, forced draft fan, fuel pump and other hardware in good condition, there are some adjustments on the （）that can produce a good flame for the most efficient operation.
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A.boiler
B.main engine
C.auxiliary engine
D.incinerator
