Ch\u01b0\u01a1ng 5 – B\u00e0i 18: T\u00ednh ch\u1ea5t c\u1ee7a kim lo\u1ea1i. D\u00e3y \u0111i\u1ec7n h\u00f3a c\u1ee7a kim lo\u1ea1i<\/a><\/blockquote><\/iframe>