问题：
[单选] Smaller engines can be made more rigid than large ones and may not have （）.
connecting rods。crankshaft。crankcase。through bolt。
问题：
[单选] Smaller engines can be made more rigid than large ones and may not have （）.
through bolts。dividing walls。sloping surfaces。relative angle。
问题：
[单选] Smaller engines can be made more rigid than large ones and may not have （）.
through bolts。turbo-chargers。bed plates。colum。
问题：
[单选] “Stand by engine” means （）.
prepare to stop the engine。assemble an engine on its bedplate。make an engine ready for starting。make an engine run steadily。
问题：
[单选] Such an engine frame helps （） the engine and so protect the bearings from the deformation forces transmitted via the ships double bottom.
to stiffen。to soften。to loosen。to wear。
问题：
[单选] The （） of the main shaft should be measured with a （）.
clearance；calipers。sinking；bridge gauge。diameter；bridge gauge。clearance；lead wire。
问题：
[单选] The （） is not properly set thus causing either advanced or retarded firing.
piston。fuel injection pump。crankshaft。oil ca。
问题：
[单选] The （） of the lubricant should be sufficient to hold the film together, but it should allow the lubricant to flow easily.
specific gravity。viscosity。acid value。calorific value。
问题：
[单选] The （） chamber is enclosed between the cylinder head and piston.
lubrication。injection。cooling。combustio。
问题：
[单选] The （） or balance tank collects the re-circulated fuel oil.
buffer。sump。bilge。overflowing。
