1. stainless steel
2. gun metal
3. German silver
4. duralumin
duralumin
1. 94% aluminum, 4% copper and 0.5% Mn, Mg, Si and Fe
2. 92.5% aluminum, 4% copper, 2% nickel, and 1.5% Mg
3. 10% aluminum and 90% copper
4. 90% magnesium and 9% aluminum with some copper
10\% aluminum and 90\% copper
1. lead base alloy
2. tin base alloy
3. copper base alloy
4. Both a & c
Both a & c
1. 87.75% Sn, 4% Cu, 8% Sb, 0.25% Bi
2. 90% Sn, 2% Cu, 4% Sb, 2% Bi, 2% Mg
3. 87% Sn, 4% Cu, 8% Sb, 1% Al
4. 82% Sn, 4% Cu, 8% Sb, 3% Al, 3% Mg
87.75\% Sn, 4\% Cu, 8\% Sb, 0.25\% Bi
1. 94% aluminum, 4% copper and 0.5% Mn, Mg, Si and Fe
2. 92.5% aluminum, 40% copper, 2% nickel, and 1.5% Mg
3. 10% aluminum and 90% copper
4. 90% magnesium and 9% aluminum with some copper
94\% aluminum, 4\% copper and 0.5\% Mn, Mg, Si and Fe
1. greater than 7
2. less than 7
3. equal to 7
4. pH value has nothing to do with neutral solution
equal to 7
1. greater than 7
2. less than 7
3. equal to 7
4. pH value has nothing to do with neutral solution
less than 7
1. greater than 7
2. equal to 7
3. less than 7
4. pH value has nothing to do with basic solution
greater than 7
1. purification of metal
2. grain refinement
3. working at lower temperature
4. all of the above
all of the above
1. ferrite and cementite
2. cementite and gamma iron
3. ferrite and austenite
4. ferrite and iron graphite
ferrite and cementite