下列实验操作或装置正确的是 请选择ABCD'm4B)a.K)s.x7}7r/f'F5L3N1j1@
A.7r/f'F5L3N1j1@
B.7r/f'F5L3N1j1@
C.7r/f'F5L3N1j1@
D.7r/f'F5L3N1j1@