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Chapter 8 Examples of Hydraulic Systems test
1、 When the hydraulic transmission system need high pressure,which pump will be selected。（ ）
A:Gear pump
B:Vane pump
C:Piston pump
D:both Piston pump and Vane pump
答案: Piston pump
2、 The area of input port is bigger than the area of out port in external pump,the main reason is （ ）。
A:increasing capacity of o