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]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]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]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]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]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]Crank web deflection readings will give a positive indication of （）.A . worn main bearing journalsB . torsional stress deformationC . slack thrust bearingsD . bearing shells shim dimensio

[单选题]The crank pin journal is provided with large bores for （）.A . lubricationB . coolingC . balancing purposeD . ventilatio