（）uses one or two high pressure pumps for all the cylinders with one more standby, while（）have a separate high-pressure pump for each cylinder.
1、The knot used to join two lines or two
The knot used to join two lines or two large hawsers for towing is called a（）.Asquare knotBcarrick bendCsheet bendDbowline
2、（）is a space system using one or more
（）is a space system using one or more artificial earth satellites.ASatellite networkBSatellite linkCGMDSSDSatellite system
3、One cause of high head pressure occurr
One cause of high head pressure occurring in a refrigeration system can be （）.Ainsufficient cooling water flow to the condenserBa low refrigerant charge in the systemCthe liquid valve is open too muchDhigh evaporator superheat
4、High cylinder firing pressure, accompa
High cylinder firing pressure, accompanied by low exhaust temperature, can result from （）Aimproper fuel rack positingBlengthy exhaust valve durationCextend operation at light loadDexcessively early injection timing
5、Two well-developed high pressure areas
Two well-developed high pressure areas may be separated by a（）.AHill of low pressureBTrough of low pressureCValley of low pressureDRidge of low pressure
6、（）is a space system using one or more
（）is a space system using one or more artificial earth satellites.Asatellite networkBSatellite LinkCINMARSATDSatellite System