單項(xiàng)選擇題The abbreviation BDC means ().

A.Boston Diesel Company
B.base circle diameter
C.switch board case
D.bottom dead center


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2.單項(xiàng)選擇題The () or balance tank collects the re-circulated fuel oil.

A.overflowing
B.sump
C.bilge
D.buffer

3.單項(xiàng)選擇題The () or balance tank collects the re-circulated fuel oil.

A.buffer
B.sump
C.bilge
D.overflowing

4.單項(xiàng)選擇題The () chamber is enclosed between the cylinder head and piston.

A.lubrication
B.injection
C.cooling
D.combustion

5.單項(xiàng)選擇題The () of the lubricant should be sufficient to hold the film together, but it should allow the lubricant to flow easily.

A.specific gravity
B.viscosity
C.acid value
D.calorific value