The cube (1) is pressed vertically on the spring and does not touch the container wall. At this time, the length of the spring is shortened to 2 cm. Every time the spring length changes 1cm, the force changes 1N, and the spring changes from 10cm to 2cm, which is 8cm shorter. Therefore, the pressure of object A on the spring, that is, its own gravity is 8N, and its mass is 8 cm. Therefore, A is correct and does not conform to the meaning of the question;

(2) After pouring water, the spring returns to its original length, and then F floats =G=8N, in order of F floats = ρ water gV, and V row =F floats ρ water G = 8n1.0×103kg/m3×10n/kg = 8×.

So the depth of the object immersed in water h=V row S=8× 10? 4m3 10× 10× 10？ 4m2 = 0.08m

According to the meaning of the question, when the object is completely submerged, F floats' = ρ water gV row' =1.0×103kg/m3×10n/kg× (0.1m) 3 =10n;

The depth of the object immersed in water increased by 0.02 meters,

When an iron block is placed on the wood block, the water surface will rise when the wood block falls. Because the bottom area of the block is 100cm2 and the bottom area of the container is 200cm2, the area around the block is 200cm2-100cm2 =100cm2, so the falling distance of the block is equal to the rising distance of the water surface, so the length of the spring is reduced by 60.

(3) Because the length of the spring is reduced by 1cm, the supporting force of the spring to the object is F2 =1n;

Taking the whole composed of wood block and iron block as the research object, the stress analysis is carried out: F floating' +F2=G+G iron block,

Then G Fe =F floating'+F2-g =10n+1n-8n = 3n;

M iron =G iron g = 3n10n/kg = 0.3kg; So b is wrong and in line with the meaning of the question;

(4) The shortened length of the spring is 1cm, that is, the length of the compression spring is △ L = L-1cm =1cm = 9 cm; Water depth: h = la+△ l =10cm+9cm =19cm = 0.19m;

The pressure at the bottom of the container is strong: P=ρ water GH =1.0×103kg/m3×10n/kg× 0.19m =1900pa, so d is correct and does not meet the meaning of the question;

So choose: B.