A.steel
B.copper
C.cast iron
D.stainless steel
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A.around
B.among
C.in
D.between
A.frame
B.piston
C.crankcase
D.explosion plate
A.screwing into
B.being screw on
C.to screw on
D.screwed into
A.bolts welded into the cylinder head
B.bolts welded into the cylinder frames
C.studs screwed into the cylinder head
D.studs screwed into the cylinder frames
A.fuel valve
B.lubricator
C.indicator valve
D.the starting valve
最新試題
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Lube oil cannot be efficiently filtered if its （）.
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In using reduction gears to obtain efficient propeller speeds, （）.