On a medium-speed main propulsion diesel engine, the crank-pin or crank journalbearings receive lubricating oil from( ).A.a spindle lubricatorB.an oil jetC.internal splashingD.drilled passages in the crankshaft
On a medium-speed main propulsion diesel engine, the crank-pin or crank journalbearings receive lubricating oil from( ).
A.a spindle lubricator
B.an oil jet
C.internal splashing
D.drilled passages in the crankshaft
相关考题：
The air crash was caused by the (). Thus, he should take all responsibility for that. A、crewB、pilotC、staffD、engine
You want to start monitoring statistics on the distribution of storage engines that are being used and the average sizes of tables in the various databases.Some details are as follows:The Mysql instance has 400 databases. Each database on an average consists of 25-50 tables. You use the query:SELECT TABLE_SCHEMA, ‘ENGINE‘, COUNT (*), SUM(data_length) total_size FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_TYPE= ‘BASE TABLE‘ GROUP BY TABLE_SCHEMA, ‘ENGINE‘ ;Why is this query slow to execute?（）A.Collecting information requires large numbers of locks on various INFORMATION_SCHEMA tablesB.Aggregating details from various storage engine caches for the final output is time consumingC.Collecting information requires various disk-level operations and is time consumingD.Counting and summarizing all table pages in the InnoDB shared tablespace is time consuming
(piston area)×(piston stroke)×(numbers of the cylinders)=engine( ).A.brake horsepowerB.displacementC.cylinder volumeD.cylinder clearance
10、柴油机的燃料“Diesel”是以发明人名字命名的