The crank pin journal is provided with large bores for （）.

Engine system includes __________________, starting system, __________________ cooling system, fuel supply system, crank-connection rod mechanism and __________________.

Operating conditions in the crank chamber are very （） those in the cylinder.

With the crank in position in the engine， some measurements can be taken by a special bridge gauge and （）.

With four-stroke engines， it takes four revolutions of the crank shaft to make （） power stroke(s).

In Yuan Dynasty, people made some improvements on lulu by fixing a crank onto the pulley.( )

在JDBC中使用事务,想要回滚事务的方法是()。 A: Connection的commit() B: Connection的setAutoCommit（） C: D: Connection的rollback() E: Connection的rollback()Connection的rollback（） F: Connection的close（）

列声明并创建Connection对象的语句，正确的是（）。 A: Dim ADOcn As New Connection B: Dim ADOcn As Connection C: Declare ADOcn As New Connection D: Declare ADOcn As Connection

Engine （） refers to the relative time of position of crank， at which each operation during the cycle is commenced and is completed.

整车低压电源工作模式一般分为（） A: PowerOFF B: IGON C: Crank D: ACC