The diameter of the crank-pins should be measured with a （）.

[单选题]The crank-room cover should not be opened until at least （） minutes after the engine stops.A . oneB . fifteenC . sixtyD . ninety

[单选题]Each crank is made up of two crank webs joined by a common（） to which the bottom endbearing is fitted.A . throwB . crankshaftC . crankpinD . crosshead

[单选题]数组pins的定义如下：int[]pins=newint[4]{9，2，3，1}；则pins[1]=（）A . 1B . 2C . 3D . 9

[单选题]The crank chamber oil （）.A . can be recoveredB . is only supplied to cylindersC . only feeds the main bearingD . is a kind of detergent

[单选题]With the crank in position in the engine, some measurements can be taken by a special bridge gauge and （）.A . a micrometerB . a bowlC . a feeler gaugeD . a wrench

[单选题]Which term describes piston pins having bearing surfaces in both the piston bosses and connecting rod eye?（）A . StationaryB . Full floatingC . Semi-floatingD . Free rolling

[单选题]Operating conditions in the crank chamber are very （） those in the cylinder.A . the same asB . similar toC . separated fromD . different from

[单选题]Lubricating oil is supplied to the crank-pin bearings in a marine diesel engine by （）.A . internal crankshaft passagesB . immersion in oilC . splash lubricationD . injection lubricatio

[单选题]The diameter of the gravity disc is too big It causes oil to flow through the water outlet We changed the disc and no （） is found in the water outlet.A . waterB . oilC . scaleD . ridge

[单选题]The outside diameter of the pipe is （） the diameter of the bore of the piston rod, the result being that an annular space formed between the piston rod and the pipe.A . less thanB . greater thanC . equal toD . twice larger tha