Because the castings of smaller engines are not so big and heavy, （） and cylinder block may be made in one piece.

[单选题]Smaller engines can be made more rigid than large ones and may not have （）.A . connecting rodsB . crankshaftC . crankcaseD . through bolt

[单选题]The experiment showed that the smaller fish .A． fought over a feast B. went on diet willinglyC． preferred some extra food D. challenged the boss fish

[单选题]Why is it a problem if all the smaller fish species die?A． It's not healthy for the environment.B． People only like to catch big fish.C． There are too many small fish.D． The smaller fish can get lost in the lake.

[单选题]Popular saying “cutting into smaller parts” is the most commonly seen () form.A . Time valueB . Location valueC . Added valueD . Distribution processing value

[单选题]_____ the engines, the diesel engine is ____ used engine on boardA．Between / more commonlyB．Among / the most commonlyC．Between / not more commonlyD．Among / not the most commonly

[单选题]D．iesel engines are started by supplying into the cylinders in the appropriate sequence for the required direction.A．cooling waterB．compressing airC．compressed airD．cylinder oil

[单选题]The search engines work by means of _________.A． arranging links to the InternetB． submitting specific search termC． updating a knowledge databaseD． searching engine spiders

[单选题]（） the engines, the diesel engine is（） used engine on board.A . Between；more commonlyB . Among；the most commonlyC . Between；not more commonlyD . Among；not the most commonly

[单选题]Diesel engines are started by supplying （） into the cylinders in the appropriate sequence for the required direction.A . cooling waterB . compressing airC . compressed airD . cylinder oil

[单选题]Crankshafts of medium speed engines are （） from a single piece of steel.A . unusually solid weldedB . never be solid forgedC . almost invariably solid forgedD . almost invariably be welded