The static strength test system of protective devices on tractor is a special equipment that simulates and evaluates the protection to the driver of the protective devices on tractor when the tractor rolls over through the applied load.

The results show that the toughness and displacement at peak load decrease with the fall of test temperature; the displacement at peak load of dynamic test is less than that of static test at the same temperat.

Then static test on the servo-valve has been done on the servovalve test-bed.

In this case exit oil pressure remains constant, while in a turbine s static test the main oil pump, which supplies oil to the secondary and tertiary loop, has a variable exit pressure which is a function of the speed of rotation.

The optimum conditions of static experiment was obtained.

The characteristic of dielectric barrier discharge and its influencing factors were studied through static experiment,and chemical change about NO_x and carbon soot through non-thermal plasma were discussed.

The results of the static experiment indicated that the CODCr removing rates of the test groups: "mixed culture + activated sludge", "mixed culture" and "activated sludge" were 91.