The phenomenon of_________happens easily in suction of pump and valve orifice.

_____________ orifice is not sensitivity to temperature, and thus it is usually used as throttle adjustor.

Dynamic viscosity (also known as absolute viscosity) is the measurement of the fluid's internal resistance to flow while_________viscosity refers to the ratio of dynamic viscosity to density

There are three main states of flow, such as laminar,_________and turbulence in a pipe.

When a continuity viscous fluid flows through a variable section, fluid will lose parts of energy.This can be presented by the pressure loss h_w. The h_w includes two parts: pressure losses along parallel pipes and_________losses.

The absolute pressure of a hydraulic pump inlet is 0.07MPa, so the vacuum degree of the inlet is ______ MPa, and the gauge pressure is ______ MPa. (The Atmospheric pressure is 0.1MPa)

In hydraulic transmission, use ___________to transfer force and motion. ()

A. solid
B. oil
C. gas
D. insulator

What are the most important two parameters in hydraulic transmission? ()

A. pressure and flow rate
B. pressure and load
C. pressure and speed
D. flow rate and speed

Hydraulic transmission relies on the hydrostatic pressure in the sealed volume to transfer force, such as ().

A. ten thousand ton hydraulic press
B. centrifugal pump
C. hydraulic turbine
D. hydraulic torque converter

Compared with mechanical transmission, advantages of hydraulic transmission includes ().

A. high efficiency
B. low machining accuracy required
C. accurate transmission ratio can be obtained
D. smooth movement