The crankcase can not be opened （）the parts have been cooled down.

[单选题]This container can be easily opened（）both ends.A . onB . atC . inD . by

[单选题]He opened the letter and it contained ________ .A.an important information

[单选题]C．rankcase explosions in propulsion diesel engines result fromA．the splashing of lubrication oil by the crankshaftB．the dilution of crankcase oil with particles of combustionC．broken fuel lines spraying oil on the crankcaseD．the ignition of unburned

[单选题]C．rankcase explosions in propulsion diesel engines result from ____.A．the splashing of lubrication oil by the crankshaftB．the dilution of crankcase oil with particles of combustionC．broken fuel lines spraying oil on the crankcaseD．the ignition of unb

[单选题]Regarding a Diesel engine crankcase, the general arrangement and installation should preclude the possibility of （）A . free entry of air to the crankcaseB . water entering the crankcase while engine wash-downs are being performedC . excessive oil lea

[单选题]The crankcase of many diesel engines are kept under a slight vacuum by the （）.A . scavenging action of the pistonB . piston type vacuum pump taking suction off a differential manometerC . gland exhausting manometerD . crankcase exhaust fa

[单选题]John opened the door . There _____ he had never seen before.A．a girl did standB． a girl stoodC．did a girl standD． stood a girl

[单选题]John opened the door . There _____ he had never seen before. ( )A．a girl did standB． a girl stoodC．did a girl standD． stood a girl

[单选题]E．xcessive oil foaming in the crankcase of a refrigeration compressor is most likely to occur when the compressorA．has run continuously for a long periodB．suction pressure is below normalC．oil level is below normalD．starts after a long idle period

[单选题]The crankcase cover should never be allowed to open for investigation when （）A . the engine stopsB . the engine is runningC . you repair the engineD . overhauling the engine