Month: January 2019

A. stainless steel
B. gun metal
C. german silver
D. duralumin
E. cast iron

A. lead base alloy
B. tin base alloy
C. copper base alloy
D. all of the above
E. A. and C. above

A. greater than 7
B. less than 7
C. equal to 7
D. pH value has nothing to do with neutral solution
E. none of the above

A. gamma iron (910° to 1400°C), Cu, Ag, Au, Al, Ni, Pb, Pt
B. Mg, Zn, Ti, Zr, Br, Cd
C. a iron (below 910°C and between 1400 to 1539°C), W
D. all of the above
E. none of the above

A. silver
B. gold
C. copper
D. germanium
E. german silver

A. ferrite and cementite
B. cementite and gamma iron
C. ferrite and austenite
D. ferrite and iron graphite
E. pearlite and ferrite

A. cast iron
B. vitrified clay
C. asbestos cement
D. concrete
E. mild steel

A. ferrite and cementite
B. cementite and gamma iron
C. ferrite and austenite
D. ferrite and iron graphite
E. pearlite and ferrite

A. purification of metal
B. grain refinement
C. working at lower temperature
D. all of the above
E. none of the above

A. greater than 7
B. equal to 7
C. less than 7
D. pH value has nothing to do with basic solution
E. none of the above