A.two similar metal wires
B.two dissimliar metal wires
C.two strips of metals welded together having different coefficients of thermal expansion
D.two strips of metals welded together having same coefficient of thermal expansion
A.two similar metal wires
B.two dissimliar metal wires
C.two strips of metals welded together having different coefficients of thermal expansion
D.two strips of metals welded together having same coefficient of thermal expansion