A、<span style="FONT-FAMILY: 宋体; FONT-SIZE: 14px; TEXT-DECORATION: none">基变量中始终含有人工变量</span>
B、<span style="FONT-FAMILY: 宋体; FONT-SIZE: 14px">检验数行为非负值</span>
C、<span style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 14px">.</span><span style="FONT-FAMILY: 宋体; FONT-SIZE: 14px">非基变量中含有人工变量</span>
D、<span style="FONT-FAMILY: 宋体; FONT-SIZE: 14px">检验数行有正有负</span>