A variable displacement system of hydraulic drives consists of ().
- Aa variable displacement axial piston pump
- Ba constant displacement axial piston pump
- Ca reciprocating piston pump
- Da centrifugal pum
A variable displacement system of hydraulic drives consists of ().
1、Dirt in a fuel oil system of a diesel
Dirt in a fuel oil system of a diesel engine can cause ()Adamage to strainersBover-speeding of the engineCexcessive cooling of the engineDinjector damage
2、As the displacement of a vessel increa
As the displacement of a vessel increases,the detrimental effect of free surface().AincreasesBdecreasesCremains the sameDmay increase or decrease depending on the fineness of the vessel's form
3、In a tree directory of a file system,
In a tree directory of a file system, relative path name can be used to find files for improving directory retrieval.To do this, which directory of the followings should be set up?Aparent directoryBchild directoryCworking directoryDhome directory
4、The exhaust system of a diesel engine
The exhaust system of a diesel engine is usually designed to remove exhaust gases and to ()Aprovide exhaust back pressureBprevent exhaust smoke emissionsCpower a reciprocating superchargerDmuffle exhaust gas noise
5、______is the address of.a variable or
______is the address of.a variable or a variable in which the address of another variable is stored.ADirectorBPointerCArrayDRecord
6、In a refrigeration system, foaming of
In a refrigeration system, foaming of the crankcase oil may cause the ().Aexpansion valve to overfeedBcompressor to knockCwater regulating valve to failDcrankcase drains to plug