在教“鸟”概念时,用麻雀、燕子说明“前肢为翼,无齿有喙”是鸟概念的本持征,这是适当地运用了( )
A.命题
B.案例
C.反例
D.正例
参考答案:D
下列哪些基因为抑癌基因()
A.C-Ha-ras
B.C-Ki-ras
C.C-myc
D.C-erb
E.p53
Explain the grounds upon which a person may be disqualified under the Companies Act, 1990. (10 marks)