The search engines work by means of _________.

A． arranging links to the Internet

B． submitting specific search term

C． updating a knowledge database

D． searching engine spiders

[问答题]I'll have to try using the search engines.

[单选题]搜索引擎（Search Engines）是一个对互联网上的信息资源进行收集与整理，然后供人们（）的系统。A . 查询B . 搜索C . 整理D . 修改

[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]All diesel engines are classified as（）.A . four cycleB . compression ignitionC . vacuum ignitionD . external combustio

[单选题]For most ship engines，the fuel is（）.A . natural gasB . diesel oilC . propaneD . bunker fuel

[单选题]In diesel engines designed with a crosshead, the motion of the piston rod can be described as （）.A . reciprocating at the piston pin, rotary at the crank pinB . reciprocating at the crank pin, rotary at the piston pinC . straight reciprocationD . str

[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]Lubricating systems for diesel engines are usually designed to initially provide lube oil to the engine （）A . camshaft beatingsB . main bearingsC . piston crownsD . cylinder wall

[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