both No 1 and No 2 are true
only No. 1 is true.
only No 2 is true
2 and 3.
1 and 3
1 and 2
the grain is perpendicular to the skin.
it is about 1/8 inch undersize to allow sufficient bonding material to be applied
the grain is parallel to the skin
whatever is desired for a neat, clean appearance
two times the thickness of the metal
100 times the thickness of the metal.
perform a chemical composition analysis
test the viscosity of the resin immediately after mixing
have mixed enough for a test sample.
By picking up the 'noise' of any deterioration that may be present.
create sonogram pictures of the areas being inspected
analyze ultrasonic signals transmitted into the parts being inspected
none, honeycomb is usually made from a man made or fibrous material which is not susceptible to corrosion
Prime the repair with a corrosion inhibitor and seal from the atmosphere.
paint the outside area with several coats of exterior paint
strip the damaged area of all paint and shine a strong light through the structure.
use an eddy current probe on both sides of the damaged area
use dye penetrant inspection procedures, exposing the entire damaged area to the penetrant solution
an area of too much matrix between fiber layers
separation of the laminates.
less than full strength curing of the matrix
2, 3, and 4.
1,3 and 4
1,2 and 4
Acetone will soften plastic, but will not change its color
has a yellowish tint when viewed from the edge
Zinc chloride will have no effect.
选择要在Apple App Store上查看的Topgrade应用程序。